diff --git a/Documentation/SOGoDevelopersGuide.asciidoc b/Documentation/SOGoDevelopersGuide.asciidoc
index 665c96a1d..7eff99ef8 100644
--- a/Documentation/SOGoDevelopersGuide.asciidoc
+++ b/Documentation/SOGoDevelopersGuide.asciidoc
@@ -121,11 +121,14 @@ SASS/CSS
     git submodule init
     git submodule update
 
+* FlexBox compatibility http://caniuse.com/#feat=flexbox
+
 Fonts
 ^^^^^
 
 * We build a custom icons font using the online app https://icomoon.io/app/#/select[icomoon].
 * http://www.carrois.com/fira-4-0/
+* Material Design Iconic Font http://zavoloklom.github.io/material-design-iconic-font/icons.html
 
 Version Control
 ---------------