diff --git a/library/timing.c b/library/timing.c
index 7085b3b..d8b5b46 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -326,6 +326,9 @@
 
 /*
  * Checkup routine
+ *
+ * Warning: this is work in progress, some tests may not be reliable enough
+ * yet! False positives may happen.
  */
 int timing_self_test( int verbose )
 {