diff --git a/README.md b/README.md
index c42afc5..e61f57b 100644
--- a/README.md
+++ b/README.md
@@ -90,8 +90,10 @@ through sourceforge.net. Please check out http://ddclient.sf.net
     cp sample-etc_rc.d_init.d_ddclient.ubuntu /etc/init.d/ddclient
     ## enable automatic startup when booting
     update-rc.d ddclient defaults
-    ## make sure you have perl installed
-    apt-get install perl
+    ## make sure you have perl and the required modules installed
+    apt-get install perl libdata-validate-ip-perl
+    ## if you plan to use cloudflare or feedns you need the perl json module
+    apt-get install libjson-any-perl
     ## start the first time by hand
     service ddclient start