1 files changed, 2 insertions, 1 deletions

diff --git a/src/image.c b/src/image.c
index 5d08a890234..9c09c5596b9 100644
--- a/src/image.c
+++ b/src/image.c
@@ -9288,7 +9288,8 @@ DEFUN ("imagep", Fimagep, Simagep, 1, 1, 0,
 }
 
 
-DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0, "")
+DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0,
+       doc: /* */)
   (Lisp_Object spec)
 {
   ptrdiff_t id = -1;