1 files changed, 2 insertions, 0 deletions
diff --git a/grav.lua b/grav.lua
index 5f0f0bd..861a3be 100644
--- a/grav.lua
+++ b/grav.lua
@@ -17,5 +17,7 @@ parallel.waitForAny(
 		local _,key = os.pullEvent"key"
 		if key == 265 then strength=strength+0.1
 		elseif key == 264 then strength=strength-0.1 end
+		strength = math.min(strength, 4)
+		strength = math.max(strength, 0)
 	end end
 )