diff --git a/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/artifact/MgmtArtifactHash.java b/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/artifact/MgmtArtifactHash.java
index d43ae4339..770c8ffcf 100644
--- a/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/artifact/MgmtArtifactHash.java
+++ b/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/artifact/MgmtArtifactHash.java
@@ -27,6 +27,7 @@ public class MgmtArtifactHash {
      * Default constructor.
      */
     public MgmtArtifactHash() {
+        // used for jackson to instantiate
     }
 
     /**