diff --git a/README.md b/README.md
index c454fbe..d817950 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,8 @@ Demonstrate how to remove warning messages for full on-line automation.
 
 ![StairsAutomation result](img/StairsAutomation_result.png)
 
-- Stair #3 generates [8 warnings about overlapping railing element lines](warning_messages/warnings_stair_3_8.html).
-- Stair #4 generates [1 warning about ???](warning_messages//warnings_stair_4_1.html).
+- Stair #3 generates [8 warnings about overlapping handrail model line elements](warning_messages/warnings_stair_3_8.html).
+- Stair #4 generates [1 warning about a missing riser](warning_messages//warnings_stair_4_1.html).
 
 ## Author