diff --git a/documentation/README b/documentation/README
index e8aed86eb4..117f4be409 100644
--- a/documentation/README
+++ b/documentation/README
@@ -118,12 +118,12 @@ and of its required dependencies is to use the Python Package Index (pip).
 
 To install all required packages run:
 
- $ pip3 install sphinx sphinx_rtd_theme pyyaml
+ $ pip3 install sphinx sphinx_rtd_theme pyyaml pygments
 
 To make sure you always have the latest versions of such packages, you
 should regularly run the same command with an added "--upgrade" option:
 
- $ pip3 install --upgrade sphinx sphinx_rtd_theme pyyaml
+ $ pip3 install --upgrade sphinx sphinx_rtd_theme pyyaml pygments
 
 Also install the "inkscape" package from your distribution.
 Inkscape is need to convert SVG graphics to PNG (for EPUB