diff --git a/readme.md b/readme.md
index 0228858..f630625 100644
--- a/readme.md
+++ b/readme.md
@@ -7,17 +7,17 @@ This tool wraps imagemagick to provide a convenient utility for generating macOS
 Type `genicon` or `genicon -h` in terminal:
 
 
-  $ genicon
+      $ genicon
 
-   genicon: A command line tool for generating icons for Cocoa apps.
-   © Kaiyin Zhong 2016
+       genicon: A command line tool for generating icons for Cocoa apps.
+       © Kaiyin Zhong 2016
 
-   Usage:
-   genicon [options] INPUT OUTPUT_FOLDER
+       Usage:
+       genicon [options] INPUT OUTPUT_FOLDER
 
-   --help, -h Print this message.
-   --mac Generate icons for macOS.
-   --ios Generate icons for iOS. When neither --mac nor --ios is given, mac icons are generated by default.
+       --help, -h Print this message.
+       --mac Generate icons for macOS.
+       --ios Generate icons for iOS. When neither --mac nor --ios is given, mac icons are generated by default.
 
 # Requirements