1 files changed, 1 insertions, 1 deletions

diff --git a/src/floatfns.c b/src/floatfns.c
index 9049185307c..3199d572138 100644
--- a/src/floatfns.c
+++ b/src/floatfns.c
@@ -141,7 +141,7 @@ DEFUN ("tan", Ftan, Stan, 1, 1, 0,
 }
 
 DEFUN ("isnan", Fisnan, Sisnan, 1, 1, 0,
-       doc: /* Return non nil if argument X is a NaN.  */)
+       doc: /* Return non-nil if argument X is a NaN.  */)
   (Lisp_Object x)
 {
   CHECK_FLOAT (x);