diff --git a/courses/databases_nosql/key_concepts.md b/courses/databases_nosql/key_concepts.md
index 3cf5d72..78e99f7 100644
--- a/courses/databases_nosql/key_concepts.md
+++ b/courses/databases_nosql/key_concepts.md
@@ -34,7 +34,7 @@ When data is distributed across nodes, it can be modified on different nodes at
 
     
 
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+<p id="gdcalert1" ><span style="color: red; font-weight: bold" images/vector_clocks.png> </span></p>
 
 
 ![alt_text](images/vector_clocks.png "Vector Clocks")