diff --git a/constants.asm b/constants.asm
index a718fd8a3..4c97a7361 100644
--- a/constants.asm
+++ b/constants.asm
@@ -508,3 +508,22 @@ FUTURE_SIGHT EQU $F8
 ROCK_SMASH   EQU $F9
 WHIRLPOOL    EQU $FA
 BEAT_UP      EQU $FB
+
+; type name constants
+NORMAL   EQU $00
+FIGHTING EQU $01
+FLYING   EQU $02
+POISON   EQU $03
+GROUND   EQU $04
+ROCK     EQU $05
+BUG      EQU $07
+GHOST    EQU $08
+STEEL    EQU $09
+FIRE     EQU $14
+WATER    EQU $15
+GRASS    EQU $16
+ELECTRIC EQU $17
+PSYCHIC  EQU $18
+ICE      EQU $19
+DRAGON   EQU $1A
+DARK     EQU $1B