diff --git a/doc/Hacking.md b/doc/Hacking.md
index 45aa0bcb7..725c0c1e2 100644
--- a/doc/Hacking.md
+++ b/doc/Hacking.md
@@ -4,10 +4,11 @@ Hacking
 Developing UI Widgets
 ---------------------
 
-If you need to create new UI widgets, `utils/wbuilder.lua` is your friend. It
+`utils/wbuilder.lua` is your friend, if you need to create new UI widgets. It
 sets up a minimal environment to bootstrap KOReader's UI framework to avoid
 starting the whole reader. This gives you quick feedback loop while iterating
-through your widget changes.
+through your widget changes. It's also a handy tool for debugging widget
+issues.
 
 To get a taste of how it works, try running this command at the root of
 KOReader's source tree:
@@ -19,5 +20,5 @@ KOReader's source tree:
 It will spawn up an emulator window with a grid and simple timer widget for
 demonstration.
 
-You can add your own `UIManager:show` show call at the end of
-`utils/wbuilder.lua` to test your new widget.
+You can add more `UIManager:show` call at the end of `utils/wbuilder.lua` to
+test your new widgets.
diff --git a/frontend/apps/reader/modules/readerfooter.lua b/frontend/apps/reader/modules/readerfooter.lua
index 5fb328b07..fa5730279 100644
--- a/frontend/apps/reader/modules/readerfooter.lua
+++ b/frontend/apps/reader/modules/readerfooter.lua
@@ -17,7 +17,6 @@ local Font = require("ui/font")
 local _ = require("gettext")
 local util  = require("util")
 
-local auto_refresh_scheduled = false
 
 local ReaderFooter = InputContainer:new{
     mode = 1,
@@ -158,8 +157,16 @@ function ReaderFooter:init()
     end
     self.mode = G_reader_settings:readSetting("reader_footer_mode") or self.mode
     self:applyFooterMode()
-    if self.settings.auto_refresh_time and not auto_refresh_scheduled then
-        self:autoRefreshTime()
+    if self.settings.auto_refresh_time then
+        self.autoRefreshTime = function()
+            self:updateFooterPage()
+            UIManager:setDirty(self.view.dialog, "ui", self[1][1][1].dimen)
+            UIManager:scheduleIn(61 - tonumber(os.date("%S")), self.autoRefreshTime)
+        end
+        UIManager:scheduleIn(61 - tonumber(os.date("%S")), self.autoRefreshTime)
+        self.onCloseDocument = function()
+            UIManager:unschedule(self.autoRefreshTime)
+        end
     end
 end
 
@@ -213,19 +220,6 @@ function ReaderFooter:addToMainMenu(tab_item_table)
     })
 end
 
-function ReaderFooter:autoRefreshTime()
-    if self.settings.auto_refresh_time then
-        UIManager:scheduleIn(61 - tonumber(os.date("%S")) , function()
-            self:autoRefreshTime()
-            self:updateFooterPage()
-            UIManager:setDirty(self.view.dialog, "ui", self[1][1][1].dimen)
-        end)
-        auto_refresh_scheduled = true
-    else
-        auto_refresh_scheduled = false
-    end
-end
-
 function ReaderFooter:getBatteryInfo()
     local powerd = Device:getPowerDevice()
     return "B:" .. (powerd:isCharging() and "+" or "") .. powerd:getCapacity() .. "%"