diff --git a/README.md b/README.md
index b9603e6..d937585 100644
--- a/README.md
+++ b/README.md
@@ -370,6 +370,10 @@ public class MyTestClass
 
 `TestHelper.RuntimeInternals` assembly can be used from the runtime code because it does not depend on test-framework.
 
+> [!NOTE]
+> The "Define Constraints" is set to `UNITY_INCLUDE_TESTS || COM_NOWSPRINTING_TEST_HELPER_ENABLE` in this assembly definition files, so it is generally excluded from release builds.
+> To use the feature in release builds, add `COM_NOWSPRINTING_TEST_HELPER_ENABLE` to the "Define Symbols" at build time.
+
 #### ScreenshotHelper
 
 `ScreenshotHelper` is a utility class to take a screenshot and save it to a file.
diff --git a/RuntimeInternals/TestHelper.RuntimeInternals.asmdef b/RuntimeInternals/TestHelper.RuntimeInternals.asmdef
index 8807558..0553ed6 100644
--- a/RuntimeInternals/TestHelper.RuntimeInternals.asmdef
+++ b/RuntimeInternals/TestHelper.RuntimeInternals.asmdef
@@ -8,7 +8,9 @@
     "overrideReferences": false,
     "precompiledReferences": [],
     "autoReferenced": false,
-    "defineConstraints": [],
+    "defineConstraints": [
+        "UNITY_INCLUDE_TESTS || COM_NOWSPRINTING_TEST_HELPER_ENABLE"
+    ],
     "versionDefines": [],
     "noEngineReferences": false
 }
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