diff --git a/C_Questline.lua b/C_Questline.lua
new file mode 100644
index 0000000..ceb3055
--- /dev/null
+++ b/C_Questline.lua
@@ -0,0 +1,44 @@
+---@meta
+---
+--- C_Questline is a namespace for functions related to the quest line system.
+---
+--- @class C_Questline
+C_Questline = {
+	--- Returns an array of available quest lines for the specified map
+	--- @param uiMapID number The map ID to get quest lines for
+	--- @return table questLines Array of available quest lines
+	GetAvailableQuestLines = function(uiMapID) end,
+
+	--- Returns an array of force visible quests for the specified map
+	--- @param uiMapID number The map ID to get quests for
+	--- @return table questIDs Array of quest IDs
+	GetForceVisibleQuests = function(uiMapID) end,
+
+	--- Returns information about a specific quest line
+	--- @param questID number The quest ID to get information for
+	--- @param uiMapID? number Optional map ID
+	--- @param displayableOnly? boolean Optional flag for displayable quests only
+	--- @return table questLineInfo Information about the quest line
+	GetQuestLineInfo = function(questID, uiMapID, displayableOnly) end,
+
+	--- Returns an array of quests in a quest line
+	--- @param questLineID number The quest line ID to get quests for
+	--- @return table questIDs Array of quest IDs in the quest line
+	GetQuestLineQuests = function(questLineID) end,
+
+	--- Returns whether a quest line is complete
+	--- @param questLineID number The quest line ID to check
+	--- @return boolean isComplete Whether the quest line is complete
+	IsComplete = function(questLineID) end,
+
+	--- Returns whether a quest line ignores account completed filtering
+	--- @param uiMapID number The map ID to check
+	--- @param questLineID number The quest line ID to check
+	--- @return boolean questLineIgnoresAccountCompletedFiltering Whether the quest line ignores account completed filtering
+	QuestLineIgnoresAccountCompletedFiltering = function(uiMapID, questLineID) end,
+
+	--- Requests quest lines for a specific map
+	--- @param uiMapID number The map ID to request quest lines for
+	--- @return nil
+	RequestQuestLinesForMap = function(uiMapID) end,
+}