1 files changed, 2 insertions, 1 deletions

diff --git a/src/fns.c b/src/fns.c
index 1d44afadcd3..ac42c96037b 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -198,7 +198,8 @@ The last argument is not copied, just used as the tail of the new list.")
 DEFUN ("concat", Fconcat, Sconcat, 0, MANY, 0,
   "Concatenate all the arguments and make the result a string.\n\
 The result is a string whose elements are the elements of all the arguments.\n\
-Each argument may be a string, a list of numbers, or a vector of numbers.")
+Each argument may be a string, a list of characters (integers),\n\
+or a vector of characters (integers).")
   (nargs, args)
      int nargs;
      Lisp_Object *args;