diff --git a/source/MaterialXTest/MaterialXCore/Value.cpp b/source/MaterialXTest/MaterialXCore/Value.cpp
index 4ab0e61801..31c333d211 100644
--- a/source/MaterialXTest/MaterialXCore/Value.cpp
+++ b/source/MaterialXTest/MaterialXCore/Value.cpp
@@ -79,6 +79,7 @@ TEST_CASE("Value strings", "[value]")
     REQUIRE_THROWS_AS(mx::fromValueString<bool>("1"), mx::ExceptionTypeError);
     REQUIRE_THROWS_AS(mx::fromValueString<mx::Color3>("1"), mx::ExceptionTypeError);
 
+    // Parse value strings using structure syntax features.
     REQUIRE(mx::parseStructValueString("{{1;2;3};4}") == (std::vector<std::string>{"{1;2;3}","4"}));
     REQUIRE(mx::parseStructValueString("{1;2;3;4}") == (std::vector<std::string>{"1","2","3","4"}));
     REQUIRE(mx::parseStructValueString("{1;{2;3};4}") == (std::vector<std::string>{"1","{2;3}","4"}));