diff --git a/main.c b/main.c
index c95d5e9..a224430 100644
--- a/main.c
+++ b/main.c
@@ -61,7 +61,7 @@ static int player_y = 100;
 static float player_vx = 0.0;
 static float player_vy = 0.0;
 static float player_ax = 0.0;
-static float player_ay = 0.0;
+static float player_ay = 9.81;
 
 void key_down(char k)
 {
@@ -71,7 +71,7 @@ void key_down(char k)
 	{
 		case 'a': player_ax = -1; break;
 		case 'd': player_ax = 1; break;
-		case 0x20: /*jump();*/ break;
+		case 0x20: player_ay -= 1; break;
 	}
 }
 
@@ -83,6 +83,7 @@ void key_up(char k)
 	{
 		case 'a': player_ax = 0; break;
 		case 'd': player_ax = 0; break;
+		case 0x20: player_ay += 1; break;
 	}
 }