1 files changed, 1 insertions, 1 deletions
diff --git a/array.c b/array.c
index b7be69afd6..172bf4914d 100644
--- a/array.c
+++ b/array.c
@@ -2823,7 +2823,7 @@ recursive_cmp(ary1, ary2, recur)
 
 /*
  *  call-seq:
- *     array <=> other_array   ->  -1, 0, +1
+ *     array <=> other_array   ->  -1, 0, +1 or nil
  *
  *  Comparison---Returns an integer (-1, 0,
  *  or +1) if this array is less than, equal to, or greater than