document a function

diff --git a/include/simgrid/s4u/Semaphore.hpp b/include/simgrid/s4u/Semaphore.hpp
index dc8910d..974a1e2 100644 (file)
--- a/include/simgrid/s4u/Semaphore.hpp
+++ b/include/simgrid/s4u/Semaphore.hpp
@@ -50,6 +50,7 @@ public:
   static SemaphorePtr create(unsigned int initial_capacity);
 
   void acquire();
+  /** Returns true if there was a timeout */
   bool acquire_timeout(double timeout);
   void release();
   int get_capacity() const;