diff --git a/src/data/move.ts b/src/data/move.ts
index 4402d9f30cc..a9a5e9e97fb 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -2275,13 +2275,18 @@ export class WeatherBallTypeAttr extends VariableMoveTypeAttr {
   }
 }
 
+/**
+ * Changes the move's type to match the current terrain.
+ * Has no effect if the user is not grounded.
+ * @returns whether the type change was successful
+ */
 export class TerrainPulseTypeAttr extends VariableMoveTypeAttr {
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
     if(!user.isGrounded)
       return false;
 
     const currentTerrain = user.scene.arena.getTerrainType();
-    const type = (args[0] as Utils.IntegerHolder);
+    const type = (args[0] as Utils.IntegerHolder); // the move's type
 
     switch (currentTerrain) {
       case TerrainType.MISTY: