README.md in mapsnatcher-0.1 vs README.md in mapsnatcher-0.1.1

@@ -7,10 +7,24 @@
 
 You can use a tool such as
 [ChromeCacheView](https://www.nirsoft.net/utils/chrome_cache_view.html) to find
 these URLs easily.
 
+## Installation
+
+You will need ImageMagick and its development headers installed in order to
+build the dependencies. For Ubuntu these are:
+
+```sudo apt-get install imagemagick libmagickwand-dev```
+
+Once set up, install through RubyGems:
+
+```gem install mapsnatcher```
+
+To process larger maps, you may need to comment out or modify the resource
+policies in `/etc/ImageMagick-6/policy.xml`.
+
 ## Usage
 
 Usage is as follows:
 
 ```mapsnatcher "http://mapwebsite.com/0/XXX/YYY.png"```
@@ -22,5 +36,7 @@
 ```mapsnatcher -b "http://mapwebsite.com/0/XXX/YYY.png"```
 
 If you are unsure of the boundaries and would like to capture the entire map,
 add the `-b` argument and you will only need to enter one valid coordinate;
 `mapsnatcher` will do the rest.
+
+If you would like to save the tiles, add the `-s` argument.