diff --git a/docs/upgrades.md b/docs/upgrades.md
index f934dbd..b54fa5f 100644
--- a/docs/upgrades.md
+++ b/docs/upgrades.md
@@ -13,6 +13,7 @@ Upgrades are stored in the following format:
     }
 
 You can use hasUpg(layer, id) to determine if the player has an upgrade. This is useful for implementing bonuses.
+Hint: Basic point gain is calculated in game.js's "getPointGain".
 
 Each upgrade should have an id where the first digit is the row and the second digit is the column.
 Individual upgrades can have these features: