diff --git a/README.md b/README.md
index 12ec140..a136423 100644
--- a/README.md
+++ b/README.md
@@ -25,8 +25,8 @@ Increases the internal timer in the clock by `dt`.
 
 `expired` will be true for one-time clocks whose time has passed, so their function has been invoked.
 
-`local expired = clock:setTime(time)`
-Changes the internal time manually. It never invokes `callback`. Returns whether the clock is expired.
+`clock:reset([running])`
+Changes the internal timer manually to `running`, or to 0 if nothing is specified. It never invokes `callback`.
 
 
 Examples
@@ -42,8 +42,16 @@ Examples
     local c1 = cron.after(5, printMessage)
     local c2 = cron.after(5, print, 'Hello')
 
+    c1:update(2) -- will print nothing, the action is not done yet
     c1:update(5) -- will print 'Hello' once
 
+    c1:reset() -- reset the counter to 0
+
+    -- prints 'hey' 5 times and then prints 'hello'
+    while not c1:update(1) do
+      print('hey')
+    end
+
     -- Create a periodical clock:
     local c3 = cron.every(10, printMessage)
 
diff --git a/cron.lua b/cron.lua
index bd3c3c7..6f3a8a5 100644
--- a/cron.lua
+++ b/cron.lua
@@ -86,6 +86,14 @@ local function updateEveryClock(self, dt)
   return false
 end
 
+function Clock:reset(running)
+  running = running or 0
+  checkPositiveInteger('running', running)
+
+  self.running = running
+end
+
+
 function cron.after(time, callback, ...)
   return newClock(time, callback, updateAfterClock, ...)
 end
diff --git a/spec/cron_spec.lua b/spec/cron_spec.lua
index 6b0e1c4..a698840 100644
--- a/spec/cron_spec.lua
+++ b/spec/cron_spec.lua
@@ -17,7 +17,7 @@ describe( 'cron', function()
   describe('clock', function()
 
     describe(':update', function()
-      it('throws an error if dt is a negative number', function()
+      it('throws an error if dt is not positive', function()
         local clock = cron.every(1, count)
         assert.error(function() clock:update() end)
         assert.error(function() clock:update(-1) end)
@@ -25,6 +25,21 @@ describe( 'cron', function()
       end)
     end)
 
+    describe(':reset', function()
+      it('defaults to 0', function()
+        local clock = cron.every(1, count)
+        clock:update(1)
+        clock:reset(0)
+        assert.equal(clock.running, 0)
+      end)
+      it('throws an error if dt is not positive', function()
+        local clock = cron.every(1, count)
+        assert.error(function() clock:reset(-1) end)
+        assert.error(function() clock:reset('foo') end)
+        assert.not_error(function() clock:reset() end)
+        assert.not_error(function() clock:reset(1) end)
+      end)
+    end)
   end)
 
 
@@ -68,6 +83,13 @@ describe( 'cron', function()
 
     end)
 
+    it('produces a clock that can be expired', function()
+      local c1 = cron.after(2, count)
+      assert.is_false(c1:update(1))
+      assert.is_true(c1:update(1))
+      assert.is_true(c1:update(1))
+    end)
+
     it('Passes on parameters to the callback', function()
       local c1 = cron.after(1, count, 2)
       c1:update(1)