1 files changed, 5 insertions, 1 deletions

diff --git a/src/search.c b/src/search.c
index 46ff1ec7e77..886f93f41c0 100644
--- a/src/search.c
+++ b/src/search.c
@@ -111,7 +111,11 @@ signal_failure (arg)
 }
 
 DEFUN ("looking-at", Flooking_at, Slooking_at, 1, 1, 0,
-  "Return t if text after point matches regular expression PAT.")
+  "Return t if text after point matches regular expression PAT.
+This function modifies the match data that `match-beginning',
+`match-end' and `match-data' access; save and restore the match
+data if you want to preserve them.")
+")
   (string)
      Lisp_Object string;
 {