diff --git a/README.md b/README.md
index 33e3d0daf3141c27775c033ef01fed8046291996..e7f76716893500cb4cfc08490266d816113b4eba 100644
--- a/README.md
+++ b/README.md
@@ -112,19 +112,21 @@ Delete an admin account with task :
 
 ### REFERENCE
 
-A full description can be found in `REFERENCE.md`.
+A full description can be found in `[REFERENCE.md](https://gitlab.adullact.net/adullact/puppet-freeipa/blob/master/REFERENCE.md)`.
 
 ## Limitations
 
 This module will not work well if managed passwords contain `'` or `\`. They must be banned.
 
+To deploy a server is only supported on CentOS 7. To deploy a client is supported on CentOS 7, Ubuntu 16.04 and 18.04.
+
 Acceptance tests are done :
 
  * with last available versions of Puppet 5 and Puppet 6 from puppetlabs packages AIO (facter 3 is shiped).
 
  * with CentOS 7 for FreeIPA master and replica nodes. IPA masters and replicas works only on Centos >= 7.5.
 
- * with CentOS 7 and Ubuntu 18.06 for FreeIPA clients .
+ * with Ubuntu 18.06 for FreeIPA clients .
 
 Puppet4 is EOL since 2019-01-01. Even if puppet 4.10 should work, it is not tested.
 
@@ -132,7 +134,7 @@ Puppet4 is EOL since 2019-01-01. Even if puppet 4.10 should work, it is not test
 
 Home at URL https://gitlab.adullact.net/adullact/puppet-freeipa
 
-Issues and MR are welcome. `CONTRIBUTING.md` gives some guidance about contributing process. 
+Issues and MR are welcome. `[CONTRIBUTING.md](https://gitlab.adullact.net/adullact/puppet-freeipa/blob/master/CONTRIBUTING.md)` gives some guidance about contributing process.
 If you follow these contributing guidelines your patch will likely make it into a release a little more quickly.
 
 ### Release Notes
diff --git a/metadata.json b/metadata.json
index 44e1ae990a64d973840669a1b48cd767a4363ce3..3715e479324cfa6da5af7c76e3be5acb1deb8744 100644
--- a/metadata.json
+++ b/metadata.json
@@ -27,7 +27,8 @@
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "16.04"
+        "16.04",
+        "18.04"
       ]
     }
   ],