diff --git a/src/test/contracts/string_arithmetic.mligo b/src/test/contracts/string_arithmetic.mligo
index a784d0534..89d77ff60 100644
--- a/src/test/contracts/string_arithmetic.mligo
+++ b/src/test/contracts/string_arithmetic.mligo
@@ -1,2 +1,4 @@
+(* Test that the string concatenation syntax in CameLIGO works *)
+
 let concat_syntax (s: string) =
   s ^ "test_literal"