diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionGroupId.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionGroupId.java
index 380a4a1..b604237 100644
--- a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionGroupId.java
+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionGroupId.java
@@ -20,7 +20,7 @@
 import org.onlab.util.Identifier;
 
 /**
- * Identifier of an action group in a protocol-independent pipeline.
+ * Identifier of an action group in a protocol-independent pipeline, unique within the scope of an action profile.
  */
 @Beta
 public final class PiActionGroupId extends Identifier<Integer> implements PiTableAction {