diff --git a/pages/common/git-diff.md b/pages/common/git-diff.md
index 0c895d397..f0e6d92ec 100644
--- a/pages/common/git-diff.md
+++ b/pages/common/git-diff.md
@@ -14,9 +14,9 @@
 
 `git diff --staged`
 
-- Show changes from all commits since a given date/time:
+- Show changes from all commits since a given date/time (a date expression, e.g. `1 week 2 days` or an ISO date):
 
-`git diff 'HEAD@{3 days ago}'`
+`git diff 'HEAD@{3 months|weeks|days|hours|seconds ago}'`
 
 - Show only names of changed files since a given commit: