diff --git a/Documentation/doc/Documentation/Developer_manual/Chapter_multithreading.txt b/Documentation/doc/Documentation/Developer_manual/Chapter_multithreading.txt
index f3137a64de5..ee3c79aaea2 100644
--- a/Documentation/doc/Documentation/Developer_manual/Chapter_multithreading.txt
+++ b/Documentation/doc/Documentation/Developer_manual/Chapter_multithreading.txt
@@ -9,12 +9,12 @@
 
 The header file `<CGAL/tss.h>` provides a macro `CGAL_STATIC_THREAD_LOCAL_VARIABLE(TYPE,VAR,ARG1)`
 that creates a thread local variable `VAR` of type `TYPE`, and passes `ARG1` to the
-constructor.  The variable is either `threadlocal`, or a `boost::thread_specific_ptr`,
+constructor.  The variable is either `thread_local`,
 or just a local variable if `CGAL_HAS_THREADS` is not defined.
 
 
 \section Developer_manualMutex Mutex
 
-The header file `<CGAL/mutex.h>` provides a macro `CGAL_MUTEX` and a macro `CGAL_SCOPED_LOCK(M)` that is either a `std::unique_lock<std::mutex>` or a `boost::mutex::scoped_lock`.
+The header file `<CGAL/mutex.h>` provides a macro `CGAL_MUTEX` equivalent to `std::mutex` and a macro `CGAL_SCOPED_LOCK(M)` that is a `std::unique_lock<std::mutex>`.
 
 */