diff --git a/GNUmakefile b/GNUmakefile
index 398b19547..8bd91521d 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -511,7 +511,7 @@ TEST_ADDITIONAL_FLAGS ?=
 .PHONY: tinygo-test
 tinygo-test:
 	@# TestExtraMethods: used by many crypto packages and uses reflect.Type.Method which is not implemented.
-	@# TestParseAndBytesRoundTrip/P256/Generic: relies on t.Skip() which is not implemented
+	@# TestParseAndBytesRoundTrip/P256/Generic: needs Goexit to run defers on wasm.
 	$(TINYGO) test $(TEST_ADDITIONAL_FLAGS) $(TEST_SKIP_FLAG) $(TEST_PACKAGES_HOST) $(TEST_PACKAGES_SLOW)
 	@# io/fs requires os.ReadDir, not yet supported on windows or wasi. It also
 	@# requires a large stack-size. Hence, io/fs is only run conditionally.