Add a note about fontpatcher

Terminus/README.rst

@@ -4,3 +4,23 @@ Terminus for Powerline
 :Font creator: Dimitar Zhekov
 :Version: media-fonts/terminus-font-4.36 with USE=X pcf psf ru-g
 :Patched by: `Nikolay Pavlov <https://bitbucket.org/ZyX_I>`_
+
+Note: if you want to have patched font with different USE flags use fontpatcher 
+located at https://bitbucket.org/ZyX_I/bitmap-font-patcher, it is always using 
+proper (manually adjusted) glyphs. Here are the variants controlled by USE 
+flags (see font homepage for better explanations about what each USE flag 
+does):
+
+.. table:: USE flags
+
+   =========== ============================================================================
+   USE Flag    Description
+   =========== ============================================================================
+   a-like-o    Changes view of letter 'a' - a looks like o
+   distinct-l  ll2 variant with more distinctive l (lowercase L)
+   quote       Changes view of quotes: symmetric ` and ' instead of asymmetric one
+   ru-dv       Changes view of Russian letters 'de' and 've'
+   ru-g        Changes view of Russian letter 'ge'
+   ru-i        Changes view of Russian letter 'i' - not like Latin u, but like "mirrored" N
+   ru-k        Changes view of Russian letter 'k'
+   =========== ============================================================================