diff --git a/docs/honk.5 b/docs/honk.5
index f0dc1de..3200567 100644
--- a/docs/honk.5
+++ b/docs/honk.5
@@ -46,6 +46,8 @@ Inline `code fragments` with single ticks.
 int main() { return 0; }
 ```
 .Ed
+.It headings
+Heading lines starting with #.
 .It lists
 Lists of items starting with either
 .Sq +