diff --git a/src/game/Spell.h b/src/game/Spell.h
index a185dca25..95c5d856a 100644
--- a/src/game/Spell.h
+++ b/src/game/Spell.h
@@ -45,19 +45,24 @@ enum SpellCastTargetFlags
     TARGET_FLAG_RESURRECTABLE    = 0x8000*/
 
     TARGET_FLAG_SELF            = 0x00000000,
+    TARGET_FLAG_UNUSED1         = 0x00000001,               // not used in any spells as of 3.0.3 (can be set dynamically)
     TARGET_FLAG_UNIT            = 0x00000002,               // pguid
+    TARGET_FLAG_UNUSED2         = 0x00000004,               // not used in any spells as of 3.0.3 (can be set dynamically)
+    TARGET_FLAG_UNUSED3         = 0x00000008,               // not used in any spells as of 3.0.3 (can be set dynamically)
     TARGET_FLAG_ITEM            = 0x00000010,               // pguid
     TARGET_FLAG_SOURCE_LOCATION = 0x00000020,               // 3 float
     TARGET_FLAG_DEST_LOCATION   = 0x00000040,               // 3 float
-    TARGET_FLAG_OBJECT_UNK      = 0x00000080,               // ?
+    TARGET_FLAG_OBJECT_UNK      = 0x00000080,               // used in 7 spells only
+    TARGET_FLAG_UNIT_UNK        = 0x00000100,               // looks like self target (480 spells)
     TARGET_FLAG_PVP_CORPSE      = 0x00000200,               // pguid
-    TARGET_FLAG_OBJECT          = 0x00000800,               // pguid
-    TARGET_FLAG_TRADE_ITEM      = 0x00001000,               // pguid
-    TARGET_FLAG_STRING          = 0x00002000,               // string
-    TARGET_FLAG_UNK1            = 0x00004000,               // ?
-    TARGET_FLAG_CORPSE          = 0x00008000,               // pguid
-    TARGET_FLAG_UNK2            = 0x00010000,               // pguid
-    TARGET_FLAG_GLYPH           = 0x00020000
+    TARGET_FLAG_UNIT_CORPSE     = 0x00000400,               // 10 spells (gathering professions)
+    TARGET_FLAG_OBJECT          = 0x00000800,               // pguid, 2 spells
+    TARGET_FLAG_TRADE_ITEM      = 0x00001000,               // pguid, 0 spells
+    TARGET_FLAG_STRING          = 0x00002000,               // string, 0 spells
+    TARGET_FLAG_UNK1            = 0x00004000,               // 199 spells, opening object/lock
+    TARGET_FLAG_CORPSE          = 0x00008000,               // pguid, resurrection spells
+    TARGET_FLAG_UNK2            = 0x00010000,               // pguid, not used in any spells as of 3.0.3 (can be set dynamically)
+    TARGET_FLAG_GLYPH           = 0x00020000                // used in glyph spells
 };
 
 enum SpellCastFlags