diff --git a/README.md b/README.md
index fe962a6..0f0e0e0 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@
 * redis configured with a password
 * imagemagick, ocrad and the php dependencies. For ubuntu:
 ```
-sudo apt install redis php-pear composer ocrad imagemagick
+sudo apt install redis php-pear composer ocrad imagemagick php-redis # take care on the php version
 sudo pear install mail
 sudo pear install Net_SMTP
 sudo pear install Auth_SASL