diff --git a/uppsrc/CtrlCore/gtk3-todo.txt b/uppsrc/CtrlCore/gtk3-todo.txt
index 8958fbc0a..7b309295b 100644
--- a/uppsrc/CtrlCore/gtk3-todo.txt
+++ b/uppsrc/CtrlCore/gtk3-todo.txt
@@ -1,5 +1,4 @@
 - DnD crash?
-- GUILock docs
 
 CH:
 - Redmond scrollbars width
@@ -81,3 +80,4 @@ DONE:
 - Possible issue with Capture (e.g. ide about box)
 - WithDropChoice ch issue (again...)
 - Problem with multibutton is back again
+- GUILock docs
diff --git a/uppsrc/CtrlCore/src.tpp/GuiLock_en-us.tpp b/uppsrc/CtrlCore/src.tpp/GuiLock_en-us.tpp
new file mode 100644
index 000000000..77a1c108a
--- /dev/null
+++ b/uppsrc/CtrlCore/src.tpp/GuiLock_en-us.tpp
@@ -0,0 +1,56 @@
+topic "";
+[i448;a25;kKO9;2 $$1,0#37138531426314131252341829483380:class]
+[l288;2 $$2,2#27521748481378242620020725143825:desc]
+[0 $$3,0#96390100711032703541132217272105:end]
+[H6;0 $$4,0#05600065144404261032431302351956:begin]
+[i448;a25;kKO9;2 $$5,0#37138531426314131252341829483370:item]
+[l288;a4;*@5;1 $$6,6#70004532496200323422659154056402:requirement]
+[l288;i1121;b17;O9;~~~.1408;2 $$7,0#10431211400427159095818037425705:param]
+[i448;b42;O9;2 $$8,8#61672508125594000341940100500538:tparam]
+[b42;2 $$9,9#13035079074754324216151401829390:normal]
+[2 $$0,0#00000000000000000000000000000000:Default]
+[{_} 
+[ {{10000@(113.42.0) [s0;%% [*@7;4 GUI Mutex operations]]}}&]
+[s3; &]
+[s5;:Upp`:`:EnterGuiMutex`(`): [@(0.0.255) void]_[* EnterGuiMutex]()&]
+[s2;%% Locks global GUI mutex. Reentrant.&]
+[s3;%% &]
+[s4; &]
+[s5;:Upp`:`:TryEnterGuiMutex`(`): [@(0.0.255) bool]_[* TryEnterGuiMutex]()&]
+[s2;%% Attempts to lock global GUI mutex. Returns true on success.&]
+[s3; &]
+[s4; &]
+[s5;:Upp`:`:LeaveGuiMutex`(`): [@(0.0.255) void]_[* LeaveGuiMutex]()&]
+[s2;%% Unlocks single level of global GUI mutex.&]
+[s3; &]
+[s4; &]
+[s5;:Upp`:`:LeaveGuiMutexAll`(`): [@(0.0.255) int]_[* LeaveGuiMutexAll]()&]
+[s2;%% Completely unlocks GUI mutex `- if it was locked multiple 
+times in reentrant fashion, unlocks all levels as to leave mutex 
+unlocked. Returns the number of levels unlocked.&]
+[s3; &]
+[s4; &]
+[s5;:Upp`:`:EnterGuiMutex`(int`): [@(0.0.255) void]_[* EnterGuiMutex]([@(0.0.255) int]_[*@3 n
+])&]
+[s2;%% Locks GUI mutex [%-*@3 n] times.&]
+[s3;%% &]
+[s4; &]
+[s5;:Upp`:`:ThreadHasGuiLock`(`): [@(0.0.255) bool]_[* ThreadHasGuiLock]()&]
+[s2;%% Current thread has locked GUI mutex.&]
+[s3; &]
+[s4; &]
+[s5;:Upp`:`:GetGuiLockLevel`(`): [@(0.0.255) int]_[* GetGuiLockLevel]()&]
+[s2;%% Returns reentrancy level of GUI mutex.&]
+[s3; &]
+[s3; &]
+[s4; &]
+[s5; struct_[* GuiLock]&]
+[s2;%% Constructor locks GUI mutex, destructor unlocks it.&]
+[s3; &]
+[s4; &]
+[s5; class_[* GuiUnlock]&]
+[s2;%% Constructor completely unlocks GUI mutex using LeaveGuiMutexAll 
+and stores the locking leve, destructor locks GUI mutex again 
+to the same level.&]
+[s3; &]
+[s0;%% ]]
\ No newline at end of file
diff --git a/uppsrc/CtrlCore/src.tpp/SystemDrawFn_en-us.tpp b/uppsrc/CtrlCore/src.tpp/SystemDrawFn_en-us.tpp
index 7371db86e..5c638e32b 100644
--- a/uppsrc/CtrlCore/src.tpp/SystemDrawFn_en-us.tpp
+++ b/uppsrc/CtrlCore/src.tpp/SystemDrawFn_en-us.tpp
@@ -1,5 +1,4 @@
 topic "SystemDraw utility functions";
-[2 $$0,0#00000000000000000000000000000000:Default]
 [i448;a25;kKO9;2 $$1,0#37138531426314131252341829483380:class]
 [l288;2 $$2,2#27521748481378242620020725143825:desc]
 [0 $$3,0#96390100711032703541132217272105:end]
@@ -9,6 +8,7 @@ topic "SystemDraw utility functions";
 [l288;i1121;b17;O9;~~~.1408;2 $$7,0#10431211400427159095818037425705:param]
 [i448;b42;O9;2 $$8,8#61672508125594000341940100500538:tparam]
 [b42;2 $$9,9#13035079074754324216151401829390:normal]
+[2 $$0,0#00000000000000000000000000000000:Default]
 [{_} 
 [ {{10000@(113.42.0) [s0;%% [*@7;4 SystemDraw utility functions]]}}&]
 [s3; &]