diff --git a/LuaEngine.h b/LuaEngine.h
index ffe26be..812680a 100644
--- a/LuaEngine.h
+++ b/LuaEngine.h
@@ -32,6 +32,8 @@ typedef BattlegroundTypeId BattleGroundTypeId;
 struct ItemPrototype;
 typedef ItemPrototype ItemTemplate;
 typedef SpellEffectIndex SpellEffIndex;
+struct SpellEntry;
+typedef SpellEntry SpellInfo;
 #ifdef CLASSIC
 typedef int Difficulty;
 #endif
diff --git a/MapMethods.h b/MapMethods.h
index c1c9bee..fd20363 100644
--- a/MapMethods.h
+++ b/MapMethods.h
@@ -97,6 +97,7 @@ namespace LuaMap
 
     /**
      * Returns the height of the [Map] at the given X and Y coordinates
+     * In case of no height found nil is returned
      *
      * @param float x
      * @param float y