Index: mutex_concepts.qbk
===================================================================
--- mutex_concepts.qbk	(revision 66775)
+++ mutex_concepts.qbk	(working copy)
@@ -310,6 +310,26 @@
 
 [section:locks Lock Types]
 
+[section:lock_tags Lock option tags]
+
+    #include <boost/thread/locks.hpp>
+
+    struct defer_lock_t {};
+    struct try_to_lock_t {};
+    struct adopt_lock_t {};
+    
+    const defer_lock_t defer_lock;
+    const try_to_lock_t try_to_lock;
+    const adopt_lock_t adopt_lock;
+
+These tags are used in scoped locks constructors to specify a specific behavior.
+
+*`defer_lock_t`: is used to construct the scoped lock without locking it.
+*`try_to_lock_t`: is used to construct the scoped lock trying to lock it.
+*`adopt_lock_t`: is used to construct the scoped lock without locking it but adopting ownership.
+
+[endsect]
+
 [section:lock_guard Class template `lock_guard`]
 
     #include <boost/thread/locks.hpp>