diff --git a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/GroupItemStateChangedEvent.java b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/GroupItemStateChangedEvent.java
index bae689126b7..d112c1dd14f 100644
--- a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/GroupItemStateChangedEvent.java
+++ b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/GroupItemStateChangedEvent.java
@@ -57,6 +57,11 @@ public String getType() {
 
     @Override
     public String toString() {
-        return String.format("%s through %s", super.toString(), memberName);
+        String result = String.format("%s through %s", super.toString(), memberName);
+        String source = getSource();
+        if (source != null) {
+            result = String.format("%s (source: %s)", result, source);
+        }
+        return result;
     }
 }
diff --git a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemCommandEvent.java b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemCommandEvent.java
index 7e50c7bebe7..1c1faf02b13 100644
--- a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemCommandEvent.java
+++ b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemCommandEvent.java
@@ -63,6 +63,11 @@ public Command getItemCommand() {
 
     @Override
     public String toString() {
-        return String.format("Item '%s' received command %s", itemName, command);
+        String result = String.format("Item '%s' received command %s", itemName, command);
+        String source = getSource();
+        if (source != null) {
+            result = String.format("%s (source: %s)", result, source);
+        }
+        return result;
     }
 }
diff --git a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemStateChangedEvent.java b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemStateChangedEvent.java
index 8015960cc55..434e54dc7f9 100644
--- a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemStateChangedEvent.java
+++ b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemStateChangedEvent.java
@@ -104,6 +104,11 @@ public State getOldItemState() {
 
     @Override
     public String toString() {
-        return String.format("Item '%s' changed from %s to %s", itemName, oldItemState, itemState);
+        String result = String.format("Item '%s' changed from %s to %s", itemName, oldItemState, itemState);
+        String source = getSource();
+        if (source != null) {
+            result = String.format("%s (source: %s)", result, source);
+        }
+        return result;
     }
 }