diff --git a/images/ch2-5-call-c-sum-v1.plantuml b/images/ch2-5-call-c-sum-v1.plantuml
index 59a92d9..3280dd9 100644
--- a/images/ch2-5-call-c-sum-v1.plantuml
+++ b/images/ch2-5-call-c-sum-v1.plantuml
@@ -32,8 +32,10 @@ fork
 	return sum(2, 3)
 };
 
-|#AntiqueWhite|_cgo_export.c|
-:sum(2, 3);
+|#AntiqueWhite|main.cgo2.c|
+: int sum(int a, int b) {
+	return a+b
+};
 
 endfork
 
diff --git a/images/ch2-5-call-c-sum-v1.uml.png b/images/ch2-5-call-c-sum-v1.uml.png
index c4930ef..4fc1f66 100644
Binary files a/images/ch2-5-call-c-sum-v1.uml.png and b/images/ch2-5-call-c-sum-v1.uml.png differ