diff --git a/src/corelib/io/qlockfile.cpp b/src/corelib/io/qlockfile.cpp
index ae3a7c6abc..cb1ff93ad3 100644
--- a/src/corelib/io/qlockfile.cpp
+++ b/src/corelib/io/qlockfile.cpp
@@ -84,6 +84,9 @@ QT_BEGIN_NAMESPACE
     For the use case of protecting a resource over a long time, you should therefore call
     setStaleLockTime(0), and when tryLock() returns LockFailedError, inform the user
     that the document is locked, possibly using getLockInfo() for more details.
+
+    \note On Windows, this class has problems detecting a stale lock if the
+    machine's hostname contains characters outside the US-ASCII character set.
 */
 
 /*!