diff --git a/annotation/src/main/java/lcsb/mapviewer/annotation/services/MissingRequiredAnnotations.java b/annotation/src/main/java/lcsb/mapviewer/annotation/services/MissingRequiredAnnotations.java
index c2ba975f0ed8d4665764239e5ddbb71ac1d4e9dc..b6a0266de4a78fe785ae52cf44553f9f9a4d9e15 100644
--- a/annotation/src/main/java/lcsb/mapviewer/annotation/services/MissingRequiredAnnotations.java
+++ b/annotation/src/main/java/lcsb/mapviewer/annotation/services/MissingRequiredAnnotations.java
@@ -51,7 +51,7 @@ public class MissingRequiredAnnotations implements ProblematicAnnotation {
 		StringBuilder result = new StringBuilder(new ElementUtils().getElementTag(bioEntity));
 		result.append("misses one of the following annotations: ");
 		for (MiriamType type : requiredMiriamType) {
-			result.append(type.getCommonName());
+			result.append(type.getCommonName() + ", ");
 		}
 		return result.toString();
 	}