diff --git a/README.md b/README.md
index 4e48717a2..9697c8997 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,12 @@ It browses the repository and outputs html page with statistics.
 ### Existing ruby/gem environment
 
     $ gem install git_stats
+    
+### debian stretch (9.*)
 
+    # apt-get install ruby ruby-nokogiri ruby-nokogiri-diff ruby-nokogumbo
+    # gem install git_stats
+    
 ### Ubuntu
 
     $ sudo apt-get install ruby