diff --git a/prototyping/Tests/Interpreter/concat_number_and_string/out.txt b/prototyping/Tests/Interpreter/concat_number_and_string/out.txt
index a437438d..80c9d6ee 100644
--- a/prototyping/Tests/Interpreter/concat_number_and_string/out.txt
+++ b/prototyping/Tests/Interpreter/concat_number_and_string/out.txt
@@ -9,3 +9,4 @@ value 37.0 is not a string
 
 TYPE ERROR:
 Local variable y has type string but expression has type number
+  because provided type contains v, where v is a number