Update unmatch.en.md

5 years ago · ebdc0e3939
1 changed files with 2 additions and 0 deletions
--- a/subjects/unmatch.en.md
+++ b/subjects/unmatch.en.md
@ -4,6 +4,8 @@

 Write a function, Unmatch, that returns the element of the slice (arr) that does not have a correspondent pair.

+- If there no number with a correspondent pair, it shoud return `-1`.
+
 ### Expected function

 ```go