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diff --git a/docs/developer/Locking_and_Synchronization/index.mdwn b/docs/developer/Locking_and_Synchronization/index.mdwn
index 014e4a9..42feab3 100644 (file)
--- a/docs/developer/Locking_and_Synchronization/index.mdwn
+++ b/docs/developer/Locking_and_Synchronization/index.mdwn
@@ -41,6 +41,7 @@
 * can be acquired recursively, if the thread is the same and LK_CANRECURSE is specified
 * can sleep while holding the lock.
 * used when there is a requirement or possibility of blocking/sleep/recursion/...
+* used for portability of freebsd code that uses lockmgr locks
 
 ----
 
@@ -100,4 +101,13 @@
 * can interlock sleep when given a lockmgr lock to avoid missing changes to it, or just regular tsleep
 * used to wait for conditions to happen (threads doing this are waiters)
 * can wakeup all waiters or just one, effectively notifying that a change has occured
-       
+### Notes
+* could (should?) be torn out and replaced with other locking primitives and tsleep/wakeup interlocks
+
+----
+
+## Serializers
+### Usage
+* serialize access to various hardware and other subsystems
+### Notes
+* could (should?) be torn out and carefully replaced with mtx locks