diff --git a/enum.c b/enum.c
index ce7d22434b79e5..a1966826c9614a 100644
--- a/enum.c
+++ b/enum.c
@@ -2070,6 +2070,7 @@ zip_i(VALUE val, NODE *memo, int argc, VALUE *argv)
  *     a = [ 4, 5, 6 ]
  *     b = [ 7, 8, 9 ]
  *
+ *     a.zip(b)                 #=> [[4, 7], [5, 8], [6, 9]]
  *     [1, 2, 3].zip(a, b)      #=> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
  *     [1, 2].zip(a, b)         #=> [[1, 4, 7], [2, 5, 8]]
  *     a.zip([1, 2], [8])       #=> [[4, 1, 8], [5, 2, nil], [6, nil, nil]]