diff --git a/README.md b/README.md
index 461ec18..a38c2eb 100644
--- a/README.md
+++ b/README.md
@@ -272,7 +272,7 @@ Then edit this section to fit your needs.
 | **icon**                  | Tag icon                                             | path             |
 | **init**                  | Create when awesome launch                           | boolean          |
 | **layout**                | The tag layout                                       | layout           |
-| **mwfact**                | Tiled layout master/slave ratio                      | float(0-1)       |
+| **master_width_factor**   | Tiled layout master/slave ratio                      | float(0-1)       |
 | **column_count**          | Number of columns                                    | number           |
 | **master_count**          | Number of master clients                             | number           |
 | **no_focus_stealing_in**  | Do not select this tag when a new client is added    | boolean          |
@@ -335,13 +335,13 @@ See:
 | **block_children_focus_stealing**      | Prevent popups from stealing focus                  | boolean          |
 | **default_layout**                     | The default layout for tags                         | layout           |
 | **group_children**                     | Add dialogs to the same tags as their parent client | boolean          |
-| **mwfact**                             | The default master/slave ratio                      | float (0-1)      |
+| **master_width_factor**                | The default master/slave ratio                      | float (0-1)      |
 | **force_odd_as_intrusive**             | Make all non-normal (dock, splash) intrusive        | boolean          |
 | **no_focus_stealing_out**              | Do not unselect tags when a new client is added     | boolean          |
 | **favor_focused**                      | Prefer the focused screen to the screen property    | boolean          |
 
 
-It's worth noting that some settings like `mwfact` and `default_layout` should
+It's worth noting that some settings like `master_width_factor` and `default_layout` should
 be set **before** the tag arrow. Otherwise they wont take effect at startup.
 
 **favor_focused** Is enabled by default for tags created after startup for
@@ -402,7 +402,7 @@ will allow the client into that tag. This function switch between `tile` and
         local count = #match:clients() + 1 --The client is not there yet
         if count == 2 then
             awful.layout.set(awful.layout.suit.tile,tag)
-            awful.tag.setproperty(tag,"mwfact",0.5)
+            awful.tag.setproperty(tag,"master_width_factor",0.5)
         else
             awful.layout.set(awful.layout.suit.magnifier,tag)
         end
diff --git a/example.rc.lua b/example.rc.lua
index 8b786ef..c1d39cd 100644
--- a/example.rc.lua
+++ b/example.rc.lua
@@ -93,7 +93,7 @@ end
 
 -- First, set some settings
 tyrannical.settings.default_layout =  awful.layout.suit.tile.left
-tyrannical.settings.mwfact = 0.66
+tyrannical.settings.master_width_factor = 0.66
 
 -- Setup some tags
 tyrannical.tags = {
diff --git a/init.lua b/init.lua
index 4e2791a..253efd0 100755
--- a/init.lua
+++ b/init.lua
@@ -277,7 +277,7 @@ awful.tag._add = awful.tag.add
 
 awful.tag.add = function(tag,props,override)
     props.screen,props.instances = props.screen or capi.mouse.screen,props.instances or setmetatable({}, { __mode = 'v' })
-    props.mwfact,props.layout = props.mwfact or settings.tag.mwfact or settings.mwfact,props.layout or settings.default_layout or awful.layout.max
+    props.master_width_factor,props.layout = props.master_width_factor or settings.tag.master_width_factor or settings.master_width_factor,props.layout or settings.default_layout or awful.layout.max
     local t = awful.tag._add(tag,awful.util.table.join(settings.tag,props,override))
     fallbacks[#fallbacks+1] = props.fallback and t or nil
     t:connect_signal("property::selected", function(t) on_selected_change(t,props or {}) end)
diff --git a/shortcut.lua b/shortcut.lua
index 45f01c6..fb43289 100644
--- a/shortcut.lua
+++ b/shortcut.lua
@@ -124,7 +124,7 @@ local function aero_tag()
     local t = aw_tag.add("Aero", {
         screen = c.screen,
         layout = aw_layout.suit.tile,
-        mwfact = 0.5
+        master_width_factor = 0.5
     })
 
     t:clients({c,c2})