diff --git a/app/src/main/java/com/polygraphene/alvr/VrThread.java b/app/src/main/java/com/polygraphene/alvr/VrThread.java
index bea6f3b..cb0ace1 100644
--- a/app/src/main/java/com/polygraphene/alvr/VrThread.java
+++ b/app/src/main/java/com/polygraphene/alvr/VrThread.java
@@ -257,6 +257,7 @@ private long waitFrame() {
                 }
             }
             if(!mResumed) {
+                Log.i(TAG, "Exit waitFrame. mResumed=false.");
                 return -1;
             }
             mSurfaceTexture.updateTexImage();