diff --git a/pkgs/development/python-modules/python-crontab/default.nix b/pkgs/development/python-modules/python-crontab/default.nix
index a1fb349c9ee9..0cbb5666bb05 100644
--- a/pkgs/development/python-modules/python-crontab/default.nix
+++ b/pkgs/development/python-modules/python-crontab/default.nix
@@ -35,7 +35,7 @@ buildPythonPackage rec {
     "test_07_non_posix_shell"
     # doctest that assumes /tmp is writeable, awkward to patch
     "test_03_usage"
-    # AssertionError: 4 != 0
+    # Test is assuming $CURRENT_YEAR is not a leap year
     "test_19_frequency_at_month"
   ];