diff --git a/src/bun.js/bindings/bindings.cpp b/src/bun.js/bindings/bindings.cpp
index 919505c7c2..d46d5268e5 100644
--- a/src/bun.js/bindings/bindings.cpp
+++ b/src/bun.js/bindings/bindings.cpp
@@ -5428,6 +5428,7 @@ extern "C" void JSC__JSGlobalObject__queueMicrotaskJob(JSC::JSGlobalObject* arg0
 
 #endif
 
+    // The third parameter (0) is the payload field for task-specific metadata (unused for BunPerformMicrotaskJob).
     JSC::QueuedTask task { nullptr, JSC::InternalMicrotask::BunPerformMicrotaskJob, 0, globalObject, microTaskFunction, WTF::move(microtaskArgs[0]), WTF::move(microtaskArgs[1]), WTF::move(microtaskArgs[2]), WTF::move(microtaskArgs[3]) };
     globalObject->vm().queueMicrotask(WTF::move(task));
 }