diff --git a/docs/src/reference/asciidoc/sm-examples.adoc b/docs/src/reference/asciidoc/sm-examples.adoc
index 4dfd544b..25fa7663 100644
--- a/docs/src/reference/asciidoc/sm-examples.adoc
+++ b/docs/src/reference/asciidoc/sm-examples.adoc
@@ -161,10 +161,10 @@ send various event to it.
 [source,text]
 ----
 sm>sm start
+Init foo to 0
 Entry state S0
 Entry state S1
 Entry state S11
-Init foo to 0
 State machine started
 
 sm>sm event A
@@ -180,6 +180,7 @@ Event C send
 
 sm>sm event H
 Switch foo to 1
+Internal transition source=S0
 Event H send
 
 sm>sm event C
@@ -212,6 +213,65 @@ What happens in above sample:
   variable `foo`. Then we simply go back using event _C_.
 * Event _A_ is sent again and now _S1_ does a self transition because
   guard evaluates true.
+
+Let's take closer look of how hierarchical states and their event
+handling works with a below example.
+
+[source,text]
+----
+sm>sm variables
+No variables
+
+sm>sm start
+Init foo to 0
+Entry state S0
+Entry state S1
+Entry state S11
+State machine started
+
+sm>sm variables
+foo=0
+
+sm>sm event H
+Internal transition source=S1
+Event H send
+
+sm>sm variables
+foo=0
+
+sm>sm event C
+Exit state S11
+Exit state S1
+Entry state S2
+Entry state S21
+Entry state S211
+Event C send
+
+sm>sm variables
+foo=0
+
+sm>sm event H
+Switch foo to 1
+Internal transition source=S0
+Event H send
+
+sm>sm variables
+foo=1
+
+sm>sm event H
+Switch foo to 0
+Internal transition source=S2
+Event H send
+
+sm>sm variables
+foo=0
+----
+
+What happens in above sample:
+
+* We print extended state variables in various stages.
+* With event _H_ we end up executing internal transition
+  which is logged with source state.
 * It's also worth to pay attention to how event _H_ is handled in
   different states _S0_, _S1_ and _S2_. This is a good example of how
   hierarchical states and their event handling works. If state _S2_ is
diff --git a/spring-statemachine-samples/src/main/java/demo/CommonConfiguration.java b/spring-statemachine-samples/src/main/java/demo/CommonConfiguration.java
index 28cd086b..66903897 100644
--- a/spring-statemachine-samples/src/main/java/demo/CommonConfiguration.java
+++ b/spring-statemachine-samples/src/main/java/demo/CommonConfiguration.java
@@ -27,7 +27,9 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.statemachine.event.OnStateEntryEvent;
 import org.springframework.statemachine.event.OnStateExitEvent;
+import org.springframework.statemachine.event.OnTransitionEvent;
 import org.springframework.statemachine.event.StateMachineEvent;
+import org.springframework.statemachine.transition.TransitionKind;
 
 @Configuration
 public class CommonConfiguration {
@@ -64,6 +66,11 @@ public class CommonConfiguration {
 			} else if (event instanceof OnStateExitEvent) {
 				OnStateExitEvent e = (OnStateExitEvent)event;
 				log.info("Exit state " + e.getState().getId());
+			} else if (event instanceof OnTransitionEvent) {
+				OnTransitionEvent e = (OnTransitionEvent)event;
+				if (e.getTransition().getKind() == TransitionKind.INTERNAL) {
+					log.info("Internal transition source=" + e.getTransition().getSource().getId());
+				}
 			}
 		}