diff --git a/docs/test_cases/t20001.md b/docs/test_cases/t20001.md
index 18bf4669..dfcfd490 100644
--- a/docs/test_cases/t20001.md
+++ b/docs/test_cases/t20001.md
@@ -17,7 +17,7 @@ diagrams:
     using_namespace:
       - clanguml::t20001
     start_from:
-      - usr: "c:@N@clanguml@N@t20001@F@tmain#"
+      - function: "clanguml::t20001::tmain()"
     plantuml:
       before:
         - "' t20001 test sequence diagram"
diff --git a/docs/test_cases/t20001_sequence.png b/docs/test_cases/t20001_sequence.png
index e972c3f5..7dd16d2e 100644
Binary files a/docs/test_cases/t20001_sequence.png and b/docs/test_cases/t20001_sequence.png differ