diff --git a/main.js b/main.js
index afc3337..462b9ed 100644
--- a/main.js
+++ b/main.js
@@ -31,12 +31,12 @@ const argv = require('yargs')
   })
   .option('width', {
     alias: 'w',
-    description: 'Fixed width of rendering in dot units',
+    description: 'Fixed width of rendering',
     type: 'number',
   })
   .option('height', {
     alias: 'h',
-    description: 'Fixed height of rendering in dot units',
+    description: 'Fixed height of rendering',
     type: 'number',
   })
   .option('braille', {
@@ -78,7 +78,7 @@ const options = {
   headless: argv.headless,
   source: argv.tile_source,
   styleFile: argv.style_file,
-}
+};
 
 const mapscii = new Mapscii(options);
 mapscii.init().catch((err) => {
diff --git a/src/Mapscii.js b/src/Mapscii.js
index 133d756..5872279 100644
--- a/src/Mapscii.js
+++ b/src/Mapscii.js
@@ -93,8 +93,8 @@ class Mapscii {
   }
 
   _resizeRenderer() {
-    this.width = config.size && config.size.width ? config.size.width : config.output.columns >> 1 << 2;
-    this.height = config.size && config.size.height ? config.size.height : config.output.rows * 4 - 4;
+    this.width = config.size && config.size.width ? config.size.width * 2 : config.output.columns >> 1 << 2;
+    this.height = config.size && config.size.height ? config.size.height * 4 : config.output.rows * 4 - 4;
 
     this.minZoom = 4-Math.log(4096/this.width)/Math.LN2;