diff --git a/strings/rabin-karp.py b/strings/rabin-karp.py
index 04a849266ead..0154732a9ecd 100644
--- a/strings/rabin-karp.py
+++ b/strings/rabin-karp.py
@@ -48,3 +48,4 @@ def rabin_karp(pattern, text):
     pattern = "abcdabcy"
     text = "abcxabcdabxabcdabcdabcy"
     assert rabin_karp(pattern, text)
+    #test 4 complete