diff --git a/modules/turtle-wow.lua b/modules/turtle-wow.lua
index 51d3ccee..b461a1fe 100644
--- a/modules/turtle-wow.lua
+++ b/modules/turtle-wow.lua
@@ -183,6 +183,60 @@ pfUI:RegisterModule("turtle-wow", "vanilla", function ()
     end
   end)
 
+  -- add Trueshot recognition to to custom castbars.
+  if not libcast.customcast["steadyshot"] then
+    -- add trueshot to pfUI's custom casts
+    local player = UnitName("player")
+
+    -- add locales
+    pfUI_locale["enUS"]["customcast"]["TRUESHOT"] = "Steady Shot"
+    pfUI_locale["zhCN"]["customcast"]["TRUESHOT"] = "稳固射击"
+    local trueshot = L["customcast"]["TRUESHOT"]
+
+    libcast.customcast[strlower(trueshot)] = function(begin, duration)
+      if begin then
+        -- cast time is 1sec, however it takes 1.4sec to fire in average
+        local duration = duration or 1400
+
+        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\\Ability_hunter_steadyshot"
+        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
+
   -- rearrange twow's profession window additions
   HookAddonOrVariable("Blizzard_TradeSkillUI", function()
     if TradeSkillSkillCheckButton and pfUI.skin["Profession"] and pfUI_config["disabled"]["skin_Profession"] ~= "1" then