diff --git a/init.lua b/init.lua
index e174628..37f65e9 100644
--- a/init.lua
+++ b/init.lua
@@ -1,9 +1,9 @@
 -- Convert a given x,y string into a table {x=given_x, y=given_y} and return
 -- it to be used of the screen location parameters in the HUD definition
 local mtimer_location_value = function (o)
-    local x = o:gsub(',[^,]+$', '')
-    local y = o:gsub('^[^,]+,', '')
-    return {x=x, y=y}
+    local given_x = o:gsub(',[^,]+$', '')
+    local given_y = o:gsub('^[^,]+,', '')
+    return {x=given_x, y=given_y}
 end
 
 local modpath = minetest.get_modpath(minetest.get_current_modname())..DIR_DELIM
@@ -28,13 +28,13 @@ local location = {
     offset = mtimer_location_value(options['mtimer_offset'])
 }
 
-local playerData = {}
+local player_data = {}
 
 
 minetest.register_on_joinplayer(function(player)
     minetest.after(1, function(player)
-        local playerName = player:get_player_name()
-        local _hudID = player:hud_add({
+        local player_name = player:get_player_name()
+        local _hud_id = player:hud_add({
             hud_elem_type = 'text',
             position = location.position,
             alignment = location.alignment,
@@ -42,45 +42,45 @@ minetest.register_on_joinplayer(function(player)
             text = placeholder,
             number = '0x'..font_color
         })
-        playerData[playerName] = {
-            startTime = os.time(),
-            hudID = _hudID
+        player_data[player_name] = {
+            start_time = os.time(),
+            hud_id = _hud_id
         }
-        minetest.after(5, mtimer_changeText, player)
+        minetest.after(5, change_text, player)
     end, player)
 end)
 
 
 minetest.register_on_leaveplayer(function(player)
-    local playerName = player:get_player_name()
-    playerData[playerName] = nil
+    local player_name = player:get_player_name()
+    player_data[player_name] = nil
 end)
 
 
-function mtimer_changeText(player)
-    local playerName = player:get_player_name()
-    if playerName == '' then return end
+function change_text(player)
+    local player_name = player:get_player_name()
+    if player_name == '' then return end
 
     -- Save the game-detected locale. Fun fact: changing the locale on runtime
     -- from within a mod causes the UI to glitch out completely.
-    local currentLocale = os.setlocale(nil)
+    local current_locale = os.setlocale(nil)
     os.setlocale(format.locale)
 
-    local startTime = playerData[playerName].startTime
-    local hudID = playerData[playerName].hudID
+    local start_time = player_data[player_name].start_time
+    local hud_id = player_data[player_name].hud_id
 
     local time = 24*60*minetest.get_timeofday()
     local h = tostring((math.floor(time/60) % 60))
     local m = tostring((math.floor(time) % 60))
 
     local res = format.output:gsub('(+.)', {
-        ['+s'] = os.date(format.start, startTime),
+        ['+s'] = os.date(format.start, start_time),
         ['+c'] = os.date(format.current),
         ['+r'] = os.date('!'..format.runtime:gsub('(+.)', {
             ['+h'] = '%H',
             ['+m'] = '%M',
             ['+s'] = '%S'
-        }), os.time() - startTime),
+        }), os.time() - start_time),
         ['+i'] = format.ingame:gsub('(+.)', {
             ['+h'] = string.rep('0', 2-#h)..h,
             ['+m'] = string.rep('0', 2-#m)..m
@@ -88,8 +88,8 @@ function mtimer_changeText(player)
         ['+n'] = "\n"
     })
 
-    os.setlocale(currentLocale) -- Restore game-detected locale
+    os.setlocale(current_locale) -- Restore game-detected locale
 
-    player:hud_change(hudID, 'text', res)
-    minetest.after(interval, mtimer_changeText, player)
+    player:hud_change(hud_id, 'text', res)
+    minetest.after(interval, change_text, player)
 end