diff --git a/lib/libc/string/strcat.3 b/lib/libc/string/strcat.3
index 6fe13aa691c3..0d34d58a47e0 100644
--- a/lib/libc/string/strcat.3
+++ b/lib/libc/string/strcat.3
@@ -68,7 +68,10 @@ The
 function
 appends not more than
 .Fa count
-characters.
+characters from
+.Fa append ,
+and then adds a terminating
+.Ql \e0.
 .Sh RETURN VALUES
 The
 .Fn strcat