diff --git a/lib/libc/stdio/scanf.3 b/lib/libc/stdio/scanf.3
index cae4c04782d0..17fa80b5d505 100644
--- a/lib/libc/stdio/scanf.3
+++ b/lib/libc/stdio/scanf.3
@@ -358,6 +358,9 @@ a conversion, although it can be suppressed with the
 flag.
 .El
 .Pp
+The decimal point
+character is defined in the program's locale (category LC_NUMERIC).
+.Pp
 For backwards compatibility,
 other conversion characters (except
 .Ql \e0 )