diff --git a/README.md b/README.md
index cdf47f3..d3a75ea 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 [![Build Status](https://travis-ci.org/numirias/qtile-plasma.svg?branch=master)](https://travis-ci.org/numirias/qtile-plasma)
 [![codecov](https://codecov.io/gh/numirias/qtile-plasma/branch/master/graph/badge.svg)](https://codecov.io/gh/numirias/qtile-plasma)
 
-Plasma is an advanced, flexible layout for [Qtile](https://github.com/qtile/qtile/).
+Plasma is a flexible, tree-based layout for [Qtile](https://github.com/qtile/qtile/).
 
 If you're looking for a well-tested and maintained alternative to Qtile's default layouts, give it a try.
 
@@ -160,16 +160,16 @@ window.</td>
 window.</td>
   </tr>
   <tr>
-    <td><code>size(val)</code></td>
+    <td><code>size(x)</code></td>
     <td>Change size of current window.<br>
 (It's recommended to use <code>width()</code>/<code>height()</code> instead.)</td>
   </tr>
   <tr>
-    <td><code>width(val)</code></td>
+    <td><code>width(x)</code></td>
     <td>Set width of current window.</td>
   </tr>
   <tr>
-    <td><code>height(val)</code></td>
+    <td><code>height(x)</code></td>
     <td>Set height of current window.</td>
   </tr>
   <tr>
@@ -177,16 +177,16 @@ window.</td>
     <td>Reset size of current window to automatic (relative) sizing.</td>
   </tr>
   <tr>
-    <td><code>grow(amt)</code></td>
+    <td><code>grow(x)</code></td>
     <td>Grow size of current window.<br>
 (It's recommended to use <code>grow_width()</code>/<code>grow_height()</code> instead.)</td>
   </tr>
   <tr>
-    <td><code>grow_width(amt)</code></td>
+    <td><code>grow_width(x)</code></td>
     <td>Grow width of current window.</td>
   </tr>
   <tr>
-    <td><code>grow_height(amt)</code></td>
+    <td><code>grow_height(x)</code></td>
     <td>Grow height of current window.</td>
   </tr>
 </table>
diff --git a/plasma/layout.py b/plasma/layout.py
index 270392e..773132d 100644
--- a/plasma/layout.py
+++ b/plasma/layout.py
@@ -213,22 +213,22 @@ def cmd_mode_vertical_split(self):
         """
         self.add_mode = AddMode.VERTICAL | AddMode.SPLIT
 
-    def cmd_size(self, val):
+    def cmd_size(self, x):
         """Change size of current window.
 
         (It's recommended to use `width()`/`height()` instead.)
         """
-        self.focused_node.size = val
+        self.focused_node.size = x
         self.refocus()
 
-    def cmd_width(self, val):
+    def cmd_width(self, x):
         """Set width of current window."""
-        self.focused_node.width = val
+        self.focused_node.width = x
         self.refocus()
 
-    def cmd_height(self, val):
+    def cmd_height(self, x):
         """Set height of current window."""
-        self.focused_node.height = val
+        self.focused_node.height = x
         self.refocus()
 
     def cmd_reset_size(self):
@@ -236,20 +236,20 @@ def cmd_reset_size(self):
         self.focused_node.reset_size()
         self.refocus()
 
-    def cmd_grow(self, amt):
+    def cmd_grow(self, x):
         """Grow size of current window.
 
         (It's recommended to use `grow_width()`/`grow_height()` instead.)
         """
-        self.focused_node.size += amt
+        self.focused_node.size += x
         self.refocus()
 
-    def cmd_grow_width(self, amt):
+    def cmd_grow_width(self, x):
         """Grow width of current window."""
-        self.focused_node.width += amt
+        self.focused_node.width += x
         self.refocus()
 
-    def cmd_grow_height(self, amt):
+    def cmd_grow_height(self, x):
         """Grow height of current window."""
-        self.focused_node.height += amt
+        self.focused_node.height += x
         self.refocus()
diff --git a/setup.py b/setup.py
index 9f0f491..ca8e2d7 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
     name='qtile-plasma',
     packages=['plasma'],
     version='1.4.0',
-    description='An advanced, flexible layout for Qtile',
+    description='A flexible, tree-based layout for Qtile',
     author='numirias',
     author_email='numirias@users.noreply.github.com',
     url='https://github.com/numirias/qtile-plasma',