diff --git a/library/timing.c b/library/timing.c
index af27088a0..25cb70d78 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -272,7 +272,8 @@ static void TimerProc( void *TimerContext )
     (void) TimerContext;
     Sleep( alarmMs );
     mbedtls_timing_alarmed = 1;
-    // Implicit call of _endthread() is better (see MS online docs)
+    /* _endthread will be called implicitly on return
+     * That ensures execution of thread funcition's epilogue */
 }
 
 void mbedtls_set_alarm( int seconds )