diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38b941d5..89f3d414 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ All notable changes to this project will be documented in this file.
 - createsuperuser management command requires an unique email address (#318)
 - For superusers, show "Site Administration" in top navigation, note in README (#317)
 - Make Ping.body size limit configurable (#301)
+- Show sub-second durations with higher precision, 2 digits after decimal point (#321)
 
 ### Bug Fixes
 - Increase the allowable length of Matrix room alias to 100 (#320)
diff --git a/hc/lib/date.py b/hc/lib/date.py
index 6f445dc3..d95f6bc8 100644
--- a/hc/lib/date.py
+++ b/hc/lib/date.py
@@ -37,8 +37,11 @@ def format_duration(td):
 
 
 def format_hms(td):
-    total_seconds = int(td.total_seconds())
+    total_seconds = td.total_seconds()
+    if 0.01 <= total_seconds < 1:
+        return "%.2f sec" % total_seconds
 
+    total_seconds = int(total_seconds)
     result = []
 
     mins, secs = divmod(total_seconds, 60)
diff --git a/hc/lib/tests/test_date.py b/hc/lib/tests/test_date.py
index 541a6367..2a017f04 100644
--- a/hc/lib/tests/test_date.py
+++ b/hc/lib/tests/test_date.py
@@ -5,6 +5,10 @@ from hc.lib.date import format_hms, choose_next_report_date
 
 
 class DateFormattingTestCase(TestCase):
+    def test_sub_second_works(self):
+        s = format_hms(td(seconds=0.12))
+        self.assertEqual(s, "0.12 sec")
+
     def test_mins_secs_work(self):
         s = format_hms(td(seconds=0))
         self.assertEqual(s, "0 sec")