diff --git a/asteroids/main.lua b/asteroids/main.lua
index ccdaccd..27427fc 100644
--- a/asteroids/main.lua
+++ b/asteroids/main.lua
@@ -58,7 +58,7 @@ local function initState()
         local stage = game.asteroids.stages[asteroid.stage]
         asteroid.speed = stage.speed
         asteroid.facing = math.random() * phys.tau
-        asteroid.spin = 2 + math.random() * 5
+        asteroid.spin = 0.1 + math.random() * 0.1
         asteroid.radius = stage.radius
         asteroid.sprite = stage.sprite
     end
@@ -141,7 +141,7 @@ function love.update(dt)
                         radius = radius,
                         speed = speed,
                         facing = math.random() * phys.tau,
-                        spin = 2 + math.random() * 5,
+                        spin = 0.1 + math.random() * 0.1,
                         sprite = sprite,
                     })
                     table.insert(state.asteroids, {
@@ -152,7 +152,7 @@ function love.update(dt)
                         radius = radius,
                         speed = speed,
                         facing = math.random() * phys.tau,
-                        spin = 2 + math.random() * 5,
+                        spin = 0.1 + math.random() * 0.1,
                         sprite = sprite,
                     })
                 end
diff --git a/asteroids/phys.lua b/asteroids/phys.lua
index 3772423..5b1e003 100644
--- a/asteroids/phys.lua
+++ b/asteroids/phys.lua
@@ -10,12 +10,13 @@ function phys.intersects(actor1, actor2)
 end
 
 -- updates the actor's location by applying the passage of time
--- TODO spin
 function phys.update(actor, dt)
     assert(actor.speed >= 0)
     local dv = actor.speed * dt
     actor.x = actor.x + math.cos(actor.angle) * dv
     actor.y = actor.y + math.sin(actor.angle) * dv
+    local dr = actor.spin * dt
+    actor.facing = (actor.facing + dr) % phys.tau
 end
 
 function phys.apply(actor, force)