diff --git a/references_for_docker.md b/references_for_docker.md
index b799840..ab09c9b 100644
--- a/references_for_docker.md
+++ b/references_for_docker.md
@@ -44,4 +44,4 @@ docker system prune
 
 ##  Docker Certified Associate exam
 
-* [250 Practice Questions for the DCA Exam](https://medium.com/bb-tutorials-and-thoughts/250-practice-questions-for-the-dca-exam-84f3b9e8f5ce.
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+* [250 Practice Questions for the DCA Exam](https://medium.com/bb-tutorials-and-thoughts/250-practice-questions-for-the-dca-exam-84f3b9e8f5ce).
\ No newline at end of file