diff --git a/include/input/Input.h b/include/input/Input.h
index e8af5f7..b5959fb 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -243,6 +243,7 @@
 
     // Indicates that the key represents a special gesture that has been detected by
     // the touch firmware or driver.  Causes touch events from the same device to be canceled.
+    // This policy flag prevents key events from changing touch mode state.
     POLICY_FLAG_GESTURE = 0x00000008,
 
     POLICY_FLAG_RAW_MASK = 0x0000ffff,