diff --git a/src/de/inetsoftware/jwebassembly/module/WasmCallInstruction.java b/src/de/inetsoftware/jwebassembly/module/WasmCallInstruction.java
index 10ae130..f01c05d 100644
--- a/src/de/inetsoftware/jwebassembly/module/WasmCallInstruction.java
+++ b/src/de/inetsoftware/jwebassembly/module/WasmCallInstruction.java
@@ -1,5 +1,5 @@
 /*
-   Copyright 2018 - 2021 Volker Berlin (i-net software)
+   Copyright 2018 - 2022 Volker Berlin (i-net software)
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
@@ -177,4 +177,12 @@ class WasmCallInstruction extends WasmInstruction {
             paramCount--;
         }
     }
+
+    /**
+     * Only used for debugging
+     */
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + ": call $" + name.signatureName + (comment == null ? "" : "  ;; \"" + comment + "\"");
+    }
 }