diff --git a/core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java b/core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java
index e62e95b634..4bf7b6ba5a 100644
--- a/core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java
+++ b/core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java
@@ -21,11 +21,11 @@ public class MergeMaps {
 
         initialize();
 
-        //mergeFunction();
+        mergeFunction();
 
-        //streamConcat();
+        streamConcat();
 
-        //streamOf();
+        streamOf();
 
         streamEx();
     }