diff --git a/modules/turtle-wow.lua b/modules/turtle-wow.lua
index 89846072..dcf1850b 100644
--- a/modules/turtle-wow.lua
+++ b/modules/turtle-wow.lua
@@ -4,8 +4,10 @@ if not TargetHPText or not TargetHPPercText then return end
 pfUI:RegisterModule("turtle-wow", "vanilla", function ()
   local delay = CreateFrame("Frame")
   delay:SetScript("OnUpdate", function()
+    this:Hide()
+
+    -- while pfUI map is loaded, disable turtle wows window-implementation
     if pfUI.map then
-      -- while pfUI map is loaded, disable turtle wows window-implementation
       _G.WorldMapFrame_Maximize()
       pfUI.map.loader:GetScript("OnEvent")()
 
@@ -22,6 +24,51 @@ pfUI:RegisterModule("turtle-wow", "vanilla", function ()
       WorldMapFrameTitle:Hide()
     end
 
-    this:Hide()
+    -- add turtle wow custom trueshot cast to castbars recognition.
+    if not libcast.customcast["trueshot"] then
+      -- add trueshot to pfUI's custom casts
+      local player = UnitName("player")
+
+      libcast.customcast["trueshot"] = function(begin, duration)
+        if begin then
+          local duration = duration or 1000
+
+          for i=1,32 do
+            if UnitBuff("player", i) == "Interface\\Icons\\Racial_Troll_Berserk" then
+              local berserk = 0.3
+              if((UnitHealth("player")/UnitHealthMax("player")) >= 0.40) then
+                berserk = (1.30 - (UnitHealth("player") / UnitHealthMax("player"))) / 3
+              end
+              duration = duration / (1 + berserk)
+            elseif UnitBuff("player", i) == "Interface\\Icons\\Ability_Hunter_RunningShot" then
+              duration = duration / 1.4
+            elseif UnitBuff("player", i) == "Interface\\Icons\\Ability_Warrior_InnerRage" then
+              duration = duration / 1.3
+            elseif UnitBuff("player", i) == "Interface\\Icons\\Inv_Trinket_Naxxramas04" then
+              duration = duration / 1.2
+            end
+          end
+
+          local _,_, lag = GetNetStats()
+          local start = GetTime() + lag/1000
+
+          -- add cast action to the database
+          libcast.db[player].cast = "Trueshot"
+          libcast.db[player].rank = lastrank
+          libcast.db[player].start = start
+          libcast.db[player].casttime = duration
+          libcast.db[player].icon = "Interface\\Icons\\Inv_spear_07"
+          libcast.db[player].channel = nil
+        else
+          -- remove cast action to the database
+          libcast.db[player].cast = nil
+          libcast.db[player].rank = nil
+          libcast.db[player].start = nil
+          libcast.db[player].casttime = nil
+          libcast.db[player].icon = nil
+          libcast.db[player].channel = nil
+        end
+      end
+    end
   end)
 end)