diff --git a/tests/unit/streams_test.ts b/tests/unit/streams_test.ts
index fb18616939..53225a1553 100644
--- a/tests/unit/streams_test.ts
+++ b/tests/unit/streams_test.ts
@@ -541,7 +541,7 @@ Deno.test(async function decompressionStreamInvalidGzipStillReported() {
 
 Deno.test(function readableStreamFromWithStringThrows() {
   assertThrows(
-    // @ts-expect-error
+    // @ts-expect-error: primitives are not acceptable
     () => ReadableStream.from("string"),
     TypeError,
     "Failed to execute 'ReadableStream.from': Argument 1 can not be converted to async iterable.",