diff --git a/src/Spell/Spell.lua b/src/Spell/Spell.lua
index f4a5e19..9782e07 100644
--- a/src/Spell/Spell.lua
+++ b/src/Spell/Spell.lua
@@ -161,7 +161,7 @@ end
 
 -- Cast the spell
 ---@param unit Unit
----@param condition string|function
+---@param condition? string|function
 ---@return boolean
 function Spell:Cast(unit, condition)
     if condition then