diff --git a/lib/cpp/src/concurrency/PosixThreadFactory.cpp b/lib/cpp/src/concurrency/PosixThreadFactory.cpp
index 972c1c1..675e95d 100644
--- a/lib/cpp/src/concurrency/PosixThreadFactory.cpp
+++ b/lib/cpp/src/concurrency/PosixThreadFactory.cpp
@@ -114,7 +114,6 @@
 };
 
 void* PthreadThread::threadMain(void* arg) {
-  // XXX need a lock here when testing thread state
   shared_ptr<PthreadThread> thread = *(shared_ptr<PthreadThread>*)arg;
   delete reinterpret_cast<shared_ptr<PthreadThread>*>(arg);