README.markdown in pHash-1.1.1 vs README.markdown in pHash-1.1.2

@@ -6,9 +6,14 @@
 
     gem install pHash
 
 Audio hash functions needs to be compiled with C linkage, so if you get `FFI::NotFoundError` check names of methods in `libpHash`. Tiny patch for pHash 0.9.4 is in `audiophash.diff`.
 
+## Dependencies
+
+* [pHash](http://www.phash.org/download/)
+* [ffi](https://github.com/ffi/ffi#readme) ~> 1.0
+
 ## Usage
 
 Compare two mp3s:
 
     require 'phash/audio'