diff --git a/source/lib/utils/infer-label.ts b/source/lib/utils/infer-label.ts
index 7e149ac..974d3d4 100644
--- a/source/lib/utils/infer-label.ts
+++ b/source/lib/utils/infer-label.ts
@@ -9,6 +9,7 @@ const labelRegex = /^.*?\((.*?)[,)]/;
 /**
  * Infer the label of the caller.
  *
+ * @hidden
  * @param callsites - List of stack frames.
  */
 export const inferLabel = (callsites: CallSite[]) => {
diff --git a/source/test/fixtures/create-error.ts b/source/test/fixtures/create-error.ts
index 67c8e14..c0b7f9d 100644
--- a/source/test/fixtures/create-error.ts
+++ b/source/test/fixtures/create-error.ts
@@ -1,3 +1,6 @@
+/**
+ * @hidden
+ */
 export const createAnyError = (...errors: string[]) => {
 	return [
 		'Any predicate failed with the following errors:',