diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index cfc7f74..d885c34 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -28,7 +28,7 @@ repos:
       - id: isort
 
   - repo: https://github.com/pre-commit/pygrep-hooks
-    rev: v1.4.4
+    rev: v1.5.1
     hooks:
       - id: python-check-blanket-noqa
 
diff --git a/LICENCE b/LICENCE
index 5a60037..e068795 100644
--- a/LICENCE
+++ b/LICENCE
@@ -1,4 +1,4 @@
-Copyright (c) 2010 Jason Moiron and Contributors
+Copyright (c) 2010-2020 Jason Moiron and Contributors
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/README.md b/README.md
index 4201fe1..1398875 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ readable size or throughput. It is localized to:
 
 ## Usage
 
-Integer humanization:
+### Integer humanization
 
 ```pycon
 >>> import humanize
@@ -46,7 +46,7 @@ Integer humanization:
 '41'
 ```
 
-Date & time humanization:
+### Date & time humanization
 
 ```pycon
 >>> import humanize
@@ -67,7 +67,35 @@ Date & time humanization:
 'an hour ago'
 ```
 
-File size humanization:
+#### Smaller units
+
+If seconds are too large, set `minimum_unit` to milliseconds or microseconds:
+
+```pycon
+>>> import humanize
+>>> import datetime as dt
+>>> humanize.naturaldelta(dt.timedelta(seconds=2))
+'2 seconds'
+```
+```pycon
+>>> delta = dt.timedelta(milliseconds=4)
+>>> humanize.naturaldelta(delta)
+'a moment'
+>>> humanize.naturaldelta(delta, minimum_unit="milliseconds")
+'4 milliseconds'
+>>> humanize.naturaldelta(delta, minimum_unit="microseconds")
+'4000 microseconds'
+```
+```pycon
+>>> humanize.naturaltime(delta)
+'now'
+>>> humanize.naturaltime(delta, minimum_unit="milliseconds")
+'4 milliseconds ago'
+>>> humanize.naturaltime(delta, minimum_unit="microseconds")
+'4000 microseconds ago'
+```
+
+### File size humanization
 
 ```pycon
 >>> import humanize
@@ -79,7 +107,7 @@ File size humanization:
 '976.6K'
 ```
 
-Human readable floating point numbers:
+### Human-readable floating point numbers
 
 ```pycon
 >>> import humanize
diff --git a/setup.cfg b/setup.cfg
index e7f6993..1fdc9cd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,7 +2,7 @@
 max_line_length = 88
 
 [tool:isort]
-known_third_party = freezegun,humanize,pkg_resources,setuptools
+known_third_party = freezegun,humanize,pkg_resources,pytest,setuptools
 force_grid_wrap = 0
 include_trailing_comma = True
 line_length = 88
diff --git a/src/humanize/time.py b/src/humanize/time.py
index 5e90610..7f68ff9 100644
--- a/src/humanize/time.py
+++ b/src/humanize/time.py
@@ -4,6 +4,7 @@
 ``contrib.humanize``."""
 
 import datetime as dt
+from enum import Enum
 
 from .i18n import gettext as _
 from .i18n import ngettext
@@ -11,6 +12,12 @@ from .i18n import ngettext
 __all__ = ["naturaldelta", "naturaltime", "naturalday", "naturaldate"]
 
 
+class Unit(Enum):
+    MILLISECONDS = 0
+    MICROSECONDS = 1
+    SECONDS = 2
+
+
 def _now():
     return dt.datetime.now()
 
@@ -24,10 +31,11 @@ def abs_timedelta(delta):
     return delta
 
 
-def date_and_delta(value):
+def date_and_delta(value, *, now=None):
     """Turn a value into a date and a timedelta which represents how long ago
     it was.  If that's not possible, return (None, value)."""
-    now = _now()
+    if not now:
+        now = _now()
     if isinstance(value, dt.datetime):
         date = value
         delta = now - value
@@ -44,12 +52,22 @@ def date_and_delta(value):
     return date, abs_timedelta(delta)
 
 
-def naturaldelta(value, months=True):
-    """Given a timedelta or a number of seconds, return a natural
-    representation of the amount of time elapsed.  This is similar to
-    ``naturaltime``, but does not add tense to the result.  If ``months``
-    is True, then a number of months (based on 30.5 days) will be used
-    for fuzziness between years."""
+def naturaldelta(value, months=True, minimum_unit="seconds"):
+    """Return a natural representation of a timedelta or number of seconds.
+
+    This is similar to naturaltime, but does not add tense to the result.
+
+    Args:
+        value: A timedelta or a number of seconds.
+        months: If True, then a number of months (based on 30.5 days) will be used for
+            fuzziness between years.
+        minimum_unit: If microseconds or milliseconds, use those units for subsecond
+            deltas.
+
+    Returns:
+        str: A natural representation of the amount of time elapsed.
+    """
+    minimum_unit = Unit[minimum_unit.upper()]
     date, delta = date_and_delta(value)
     if date is None:
         return value
@@ -64,6 +82,17 @@ def naturaldelta(value, months=True):
 
     if not years and days < 1:
         if seconds == 0:
+            if minimum_unit == Unit.MICROSECONDS:
+                return (
+                    ngettext("%d microsecond", "%d microseconds", delta.microseconds)
+                    % delta.microseconds
+                )
+            elif minimum_unit == Unit.MILLISECONDS:
+                milliseconds = delta.microseconds / 1000
+                return (
+                    ngettext("%d millisecond", "%d milliseconds", milliseconds)
+                    % milliseconds
+                )
             return _("a moment")
         elif seconds == 1:
             return _("a second")
@@ -109,15 +138,26 @@ def naturaldelta(value, months=True):
         return ngettext("%d year", "%d years", years) % years
 
 
-def naturaltime(value, future=False, months=True):
-    """Given a datetime or a number of seconds, return a natural representation
-    of that time in a resolution that makes sense.  This is more or less
-    compatible with Django's ``naturaltime`` filter.  ``future`` is ignored for
-    datetimes, where the tense is always figured out based on the current time.
-    If an integer is passed, the return value will be past tense by default,
-    unless ``future`` is set to True."""
+def naturaltime(value, future=False, months=True, minimum_unit="seconds"):
+    """Return a natural representation of a time in a resolution that makes sense.
+
+    This is more or less compatible with Django's naturaltime filter.
+
+    Args:
+        value: A timedate or a number of seconds.
+        future: Ignored for datetimes, where the tense is always figured out based on
+            the current time. For integers, the return value will be past tense by
+            default, unless future is True.
+        months: If True, then a number of months (based on 30.5 days) will be used for
+            fuzziness between years.
+        minimum_unit: If microseconds or milliseconds, use those units for subsecond
+            times.
+
+    Returns:
+        str: A natural representation of the input in a resolution that makes sense.
+    """
     now = _now()
-    date, delta = date_and_delta(value)
+    date, delta = date_and_delta(value, now=now)
     if date is None:
         return value
     # determine tense by value only if datetime/timedelta were passed
@@ -125,7 +165,7 @@ def naturaltime(value, future=False, months=True):
         future = date > now
 
     ago = _("%s from now") if future else _("%s ago")
-    delta = naturaldelta(delta, months)
+    delta = naturaldelta(delta, months, minimum_unit)
 
     if delta == _("a moment"):
         return _("now")

diff --git a/tests/test_time.py b/tests/test_time.py
index 0c0e3ea..3ce02be 100644
--- a/tests/test_time.py
+++ b/tests/test_time.py
@@ -5,12 +5,22 @@
 import datetime as dt
 from unittest.mock import patch
 
+import pytest
 from freezegun import freeze_time
 from humanize import time
 
 from .base import HumanizeTestCase
 
-ONE_DAY = dt.timedelta(days=1)
+ONE_DAY_DELTA = dt.timedelta(days=1)
+
+# In seconds
+ONE_YEAR = 31556952
+ONE_DAY = 86400
+ONE_HOUR = 3600
+FOUR_MILLISECONDS = 4 / 1000
+ONE_MILLISECOND = 1 / 1000
+FOUR_MICROSECONDS = 4 / 1000000
+ONE_MICROSECOND = 1 / 1000000
 
 
 class FakeDate:
@@ -268,8 +278,8 @@ class TimeTestCase(HumanizeTestCase):
     def test_naturalday(self):
         # Arrange
         today = dt.date.today()
-        tomorrow = today + ONE_DAY
-        yesterday = today - ONE_DAY
+        tomorrow = today + ONE_DAY_DELTA
+        yesterday = today - ONE_DAY_DELTA
 
         someday = dt.date(today.year, 3, 5)
         someday_result = "Mar 05"
@@ -309,8 +319,8 @@ class TimeTestCase(HumanizeTestCase):
     def test_naturaldate(self):
         # Arrange
         today = dt.date.today()
-        tomorrow = today + ONE_DAY
-        yesterday = today - ONE_DAY
+        tomorrow = today + ONE_DAY_DELTA
+        yesterday = today - ONE_DAY_DELTA
 
         someday = dt.date(today.year, 3, 5)
         someday_result = "Mar 05"
@@ -340,3 +350,117 @@ class TimeTestCase(HumanizeTestCase):
 
         # Act / Assert
         self.assertManyResults(time.naturaldate, test_list, result_list)
+
+
+@pytest.mark.parametrize(
+    "seconds, expected",
+    [
+        (ONE_MICROSECOND, "a moment"),
+        (FOUR_MICROSECONDS, "a moment"),
+        (ONE_MILLISECOND, "a moment"),
+        (FOUR_MILLISECONDS, "a moment"),
+        (2, "2 seconds"),
+        (4, "4 seconds"),
+        (ONE_HOUR + FOUR_MILLISECONDS, "an hour"),
+        (ONE_DAY + FOUR_MILLISECONDS, "a day"),
+        (ONE_YEAR + FOUR_MICROSECONDS, "a year"),
+    ],
+)
+def test_naturaldelta_minimum_unit_default(seconds, expected):
+    # Arrange
+    delta = dt.timedelta(seconds=seconds)
+
+    # Act / Assert
+    assert time.naturaldelta(delta) == expected
+
+
+@pytest.mark.parametrize(
+    "minimum_unit, seconds, expected",
+    [
+        ("seconds", ONE_MICROSECOND, "a moment"),
+        ("seconds", FOUR_MICROSECONDS, "a moment"),
+        ("seconds", ONE_MILLISECOND, "a moment"),
+        ("seconds", FOUR_MILLISECONDS, "a moment"),
+        ("seconds", 2, "2 seconds"),
+        ("seconds", 4, "4 seconds"),
+        ("seconds", ONE_HOUR + FOUR_MILLISECONDS, "an hour"),
+        ("seconds", ONE_DAY + FOUR_MILLISECONDS, "a day"),
+        ("seconds", ONE_YEAR + FOUR_MICROSECONDS, "a year"),
+        ("microseconds", ONE_MICROSECOND, "1 microsecond"),
+        ("microseconds", FOUR_MICROSECONDS, "4 microseconds"),
+        ("microseconds", 2, "2 seconds"),
+        ("microseconds", 4, "4 seconds"),
+        ("microseconds", ONE_HOUR + FOUR_MILLISECONDS, "an hour"),
+        ("microseconds", ONE_DAY + FOUR_MILLISECONDS, "a day"),
+        ("microseconds", ONE_YEAR + FOUR_MICROSECONDS, "a year"),
+        ("milliseconds", ONE_MILLISECOND, "1 millisecond"),
+        ("milliseconds", FOUR_MILLISECONDS, "4 milliseconds"),
+        ("milliseconds", 2, "2 seconds"),
+        ("milliseconds", 4, "4 seconds"),
+        ("milliseconds", ONE_HOUR + FOUR_MILLISECONDS, "an hour"),
+        ("milliseconds", ONE_YEAR + FOUR_MICROSECONDS, "a year"),
+    ],
+)
+def test_naturaldelta_minimum_unit_explicit(minimum_unit, seconds, expected):
+    # Arrange
+    delta = dt.timedelta(seconds=seconds)
+
+    # Act / Assert
+    assert time.naturaldelta(delta, minimum_unit=minimum_unit) == expected
+
+
+@pytest.mark.parametrize(
+    "seconds, expected",
+    [
+        (ONE_MICROSECOND, "now"),
+        (FOUR_MICROSECONDS, "now"),
+        (ONE_MILLISECOND, "now"),
+        (FOUR_MILLISECONDS, "now"),
+        (2, "2 seconds ago"),
+        (4, "4 seconds ago"),
+        (ONE_HOUR + FOUR_MILLISECONDS, "an hour ago"),
+        (ONE_DAY + FOUR_MILLISECONDS, "a day ago"),
+        (ONE_YEAR + FOUR_MICROSECONDS, "a year ago"),
+    ],
+)
+def test_naturaltime_minimum_unit_default(seconds, expected):
+    # Arrange
+    delta = dt.timedelta(seconds=seconds)
+
+    # Act / Assert
+    assert time.naturaltime(delta) == expected
+
+
+@pytest.mark.parametrize(
+    "minimum_unit, seconds, expected",
+    [
+        ("seconds", ONE_MICROSECOND, "now"),
+        ("seconds", FOUR_MICROSECONDS, "now"),
+        ("seconds", ONE_MILLISECOND, "now"),
+        ("seconds", FOUR_MILLISECONDS, "now"),
+        ("seconds", 2, "2 seconds ago"),
+        ("seconds", 4, "4 seconds ago"),
+        ("seconds", ONE_HOUR + FOUR_MILLISECONDS, "an hour ago"),
+        ("seconds", ONE_DAY + FOUR_MILLISECONDS, "a day ago"),
+        ("seconds", ONE_YEAR + FOUR_MICROSECONDS, "a year ago"),
+        ("microseconds", ONE_MICROSECOND, "1 microsecond ago"),
+        ("microseconds", FOUR_MICROSECONDS, "4 microseconds ago"),
+        ("microseconds", 2, "2 seconds ago"),
+        ("microseconds", 4, "4 seconds ago"),
+        ("microseconds", ONE_HOUR + FOUR_MILLISECONDS, "an hour ago"),
+        ("microseconds", ONE_DAY + FOUR_MILLISECONDS, "a day ago"),
+        ("microseconds", ONE_YEAR + FOUR_MICROSECONDS, "a year ago"),
+        ("milliseconds", ONE_MILLISECOND, "1 millisecond ago"),
+        ("milliseconds", FOUR_MILLISECONDS, "4 milliseconds ago"),
+        ("milliseconds", 2, "2 seconds ago"),
+        ("milliseconds", 4, "4 seconds ago"),
+        ("milliseconds", ONE_HOUR + FOUR_MILLISECONDS, "an hour ago"),
+        ("milliseconds", ONE_YEAR + FOUR_MICROSECONDS, "a year ago"),
+    ],
+)
+def test_naturaltime_minimum_unit_explicit(minimum_unit, seconds, expected):
+    # Arrange
+    delta = dt.timedelta(seconds=seconds)
+
+    # Act / Assert
+    assert time.naturaltime(delta, minimum_unit=minimum_unit) == expected

Support milliseconds, microseconds etc.
If you run something for a minute, `humanize` is great. If you want to tell the user what you did in that time (100.000 things), and then want to brag about how fast that is (`a moment` per thing?), `humanize` is not super-great any more :)
tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-1e-06-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-4e-06-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-0.001-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-0.004-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-2-2 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-4-4 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-3600.004-an tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-86400.004-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[seconds-31556952.000004-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-1e-06-1 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-4e-06-4 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-2-2 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-4-4 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-3600.004-an tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-86400.004-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[microseconds-31556952.000004-a tests/test_time.py::test_naturaldelta_minimum_unit_explicit[milliseconds-0.001-1 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[milliseconds-0.004-4 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[milliseconds-2-2 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[milliseconds-4-4 tests/test_time.py::test_naturaldelta_minimum_unit_explicit[milliseconds-3600.004-an tests/test_time.py::test_naturaldelta_minimum_unit_explicit[milliseconds-31556952.000004-a tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-1e-06-now] tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-4e-06-now] tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-0.001-now] tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-0.004-now] tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-2-2 tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-4-4 tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-3600.004-an tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-86400.004-a tests/test_time.py::test_naturaltime_minimum_unit_explicit[seconds-31556952.000004-a tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-1e-06-1 tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-4e-06-4 tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-2-2 tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-4-4 tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-3600.004-an tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-86400.004-a tests/test_time.py::test_naturaltime_minimum_unit_explicit[microseconds-31556952.000004-a tests/test_time.py::test_naturaltime_minimum_unit_explicit[milliseconds-0.001-1 tests/test_time.py::test_naturaltime_minimum_unit_explicit[milliseconds-0.004-4 tests/test_time.py::test_naturaltime_minimum_unit_explicit[milliseconds-2-2 tests/test_time.py::test_naturaltime_minimum_unit_explicit[milliseconds-4-4 tests/test_time.py::test_naturaltime_minimum_unit_explicit[milliseconds-3600.004-an tests/test_time.py::test_naturaltime_minimum_unit_explicit[milliseconds-31556952.000004-a
tests/test_time.py::TimeUtilitiesTestCase::test_date_and_delta tests/test_time.py::TimeTestCase::test_naturaldate tests/test_time.py::TimeTestCase::test_naturalday tests/test_time.py::TimeTestCase::test_naturaldelta tests/test_time.py::TimeTestCase::test_naturaldelta_nomonths tests/test_time.py::TimeTestCase::test_naturaltime tests/test_time.py::TimeTestCase::test_naturaltime_nomonths tests/test_time.py::test_naturaldelta_minimum_unit_default[1e-06-a tests/test_time.py::test_naturaldelta_minimum_unit_default[4e-06-a tests/test_time.py::test_naturaldelta_minimum_unit_default[0.001-a tests/test_time.py::test_naturaldelta_minimum_unit_default[0.004-a tests/test_time.py::test_naturaldelta_minimum_unit_default[2-2 tests/test_time.py::test_naturaldelta_minimum_unit_default[4-4 tests/test_time.py::test_naturaldelta_minimum_unit_default[3600.004-an tests/test_time.py::test_naturaldelta_minimum_unit_default[86400.004-a tests/test_time.py::test_naturaldelta_minimum_unit_default[31556952.000004-a tests/test_time.py::test_naturaltime_minimum_unit_default[1e-06-now] tests/test_time.py::test_naturaltime_minimum_unit_default[4e-06-now] tests/test_time.py::test_naturaltime_minimum_unit_default[0.001-now] tests/test_time.py::test_naturaltime_minimum_unit_default[0.004-now] tests/test_time.py::test_naturaltime_minimum_unit_default[2-2 tests/test_time.py::test_naturaltime_minimum_unit_default[4-4 tests/test_time.py::test_naturaltime_minimum_unit_default[3600.004-an tests/test_time.py::test_naturaltime_minimum_unit_default[86400.004-a tests/test_time.py::test_naturaltime_minimum_unit_default[31556952.000004-a