diff --git a/doc/install/installation.md b/doc/install/installation.md
index e1fa822f7d630a496e95bdf11bd835cbf508e162..a9b51a2bc9a04a9c887671d471c5b7c3c9daf67f 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -52,7 +52,7 @@ If you are not familiar with vim please skip this and keep using the default edi
     sudo apt-get install -y vim
     sudo update-alternatives --set editor /usr/bin/vim.basic
 
-Install the required packages:
+Install the required packages (needed to compile Ruby and native extensions to Ruby gems):
 
     sudo apt-get install -y build-essential zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev libffi-dev curl openssh-server redis-server checkinstall libxml2-dev libxslt-dev libcurl4-openssl-dev libicu-dev logrotate