diff --git a/app/src/main/java/com/matthiaslapierre/spaceshooter/Constants.kt b/app/src/main/java/com/matthiaslapierre/spaceshooter/Constants.kt
index f69eb7b..8e0536f 100644
--- a/app/src/main/java/com/matthiaslapierre/spaceshooter/Constants.kt
+++ b/app/src/main/java/com/matthiaslapierre/spaceshooter/Constants.kt
@@ -91,7 +91,7 @@ object Constants {
     const val INITIAL_DELAY_BEFORE_ADDING_ENEMY_SHIP_IN_SECONDS = 5L
 
     /**
-     * Draw change to win the "Space ship upgrate" bonus.
+     * Draw change to win the "Space ship upgrade" bonus.
      */
     const val DRAW_CHANCE_BOLT = 20
 
diff --git a/app/src/main/java/com/matthiaslapierre/spaceshooter/resources/Drawables.kt b/app/src/main/java/com/matthiaslapierre/spaceshooter/resources/Drawables.kt
index 77edb1d..b18f6c0 100644
--- a/app/src/main/java/com/matthiaslapierre/spaceshooter/resources/Drawables.kt
+++ b/app/src/main/java/com/matthiaslapierre/spaceshooter/resources/Drawables.kt
@@ -164,7 +164,7 @@ class Drawables(
     fun getExplosionFrame(frame: Int): Drawable = get("explode_$frame".hashCode())
 
     /**
-     * Power-up. Space ship upgrate.
+     * Power-up. Space ship upgrade.
      */
     fun getPowerUpBolt() = get(R.drawable.powerup_bolt)
 
diff --git a/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/GameProcessor.kt b/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/GameProcessor.kt
index 7b1f8f3..ee32b14 100644
--- a/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/GameProcessor.kt
+++ b/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/GameProcessor.kt
@@ -288,7 +288,7 @@ class GameProcessor(
                     && !powerUp.isConsumed) {
                     powerUp.isConsumed = true
                     when (powerUp.type) {
-                        PowerUpSprite.TYPE_BOLT -> player.upgrate()
+                        PowerUpSprite.TYPE_BOLT -> player.upgrade()
                         PowerUpSprite.TYPE_SHIELD -> player.life += (Constants.PLAYER_MAX_LIFE * 0.2f).toInt()
                         PowerUpSprite.TYPE_STAR -> points += BONUS_POINTS
                         else -> points += BONUS_POINTS
diff --git a/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PlayerSprite.kt b/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PlayerSprite.kt
index 3cca4b6..f0726db 100644
--- a/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PlayerSprite.kt
+++ b/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PlayerSprite.kt
@@ -121,9 +121,9 @@ class PlayerSprite(
     }
 
     /**
-     * Upgrate the space ship.
+     * Upgrade the space ship.
      */
-    fun upgrate() {
+    fun upgrade() {
         type++
     }
 
diff --git a/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PowerUpSprite.kt b/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PowerUpSprite.kt
index c6cb738..14147fb 100644
--- a/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PowerUpSprite.kt
+++ b/app/src/main/java/com/matthiaslapierre/spaceshooter/ui/game/sprite/PowerUpSprite.kt
@@ -23,7 +23,7 @@ class PowerUpSprite(
 
     companion object {
         /**
-         * Space ship upgrate.
+         * Space ship upgrade.
          */
         const val TYPE_BOLT = 0