diff --git a/services/core/java/com/android/server/am/EventLogTags.logtags b/services/core/java/com/android/server/am/EventLogTags.logtags
index 722974b62f595..f618fc7c2a296 100644
--- a/services/core/java/com/android/server/am/EventLogTags.logtags
+++ b/services/core/java/com/android/server/am/EventLogTags.logtags
@@ -112,3 +112,5 @@ option java_package com.android.server.am
 # Report changing memory conditions (Values are ProcessStats.ADJ_MEM_FACTOR* constants)
 30050 am_mem_factor (Current|1|5),(Previous|1|5)
 
+# UserState has changed
+30051 am_user_state_changed (id|1|5),(state|1|5)
diff --git a/services/core/java/com/android/server/am/UserState.java b/services/core/java/com/android/server/am/UserState.java
index 48238b6f4cf35..42c31b1a6de4b 100644
--- a/services/core/java/com/android/server/am/UserState.java
+++ b/services/core/java/com/android/server/am/UserState.java
@@ -70,6 +70,7 @@ public final class UserState {
     public boolean setState(int oldState, int newState) {
         if (state == oldState) {
             setState(newState);
+            EventLogTags.writeAmUserStateChanged(mHandle.getIdentifier(), newState);
             return true;
         } else {
             Slog.w(TAG, "Expected user " + mHandle.getIdentifier() + " in state "