add note to readme about dependency on compression software

diff --git a/README.rst b/README.rst
index 111728ca7ef5e8695c91cab4b8cad17e8eb4e52d..8a13bd9007469f126fa4f167e35716f15aed571e 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -7,3 +7,7 @@ submodule like::
 
   git submodule init
   git submodule update
+
+
+Wikimedia dumps are usually in a compressed format such as 7z (most common), gz, or bz2. Wikiq uses your computer's compression software to read these files. Therefore wikiq depends on
+`7za`, `gzcat`, and `zcat`.