README.md in psd_native-0.3.0 vs README.md in psd_native-0.3.1

@@ -6,9 +6,10 @@
 
 Currently, PSDNative replaces these sections of PSD.rb with native code:
 
 * RGB processing
 * CMYK processing
+* Greyscale processing
 * RLE decoding
 * Some color conversions
 
 ## Installation