diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d5f7a5..876d34f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## Release 2.2.1 (June 7, 2018)
+
+### Summary
+* Update metadata for #30
+* Adding info for `null` service definitions
+
 ## Release 2.2.0 (May 18, 2018)
 
 ### Summary
diff --git a/README.md b/README.md
index 35c8a37..b010d29 100644
--- a/README.md
+++ b/README.md
@@ -359,7 +359,7 @@ Optional value. **Default: 'root'**.
 ##### `service`
 Name of the server service to notify when certificates are updated.
 
-Setting to `undef` will disable service notifications.
+Setting to `null` will disable service notifications.
 
 Optional value. Defaults:
    - **RedHat**: `httpd`
diff --git a/manifests/init.pp b/manifests/init.pp
index 9de32d5..ffccd16 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -97,7 +97,7 @@
 #
 # [*service*]
 # Name of the server service to notify when certificates are updated.
-# Setting to `undef` will disable service notifications.
+# Setting to `null` will disable service notifications.
 # This sets the default globally for use by all certs::site resources.
 # Optional value. Defaults:
 #   - 'httpd' for RedHat-based systems
diff --git a/manifests/site.pp b/manifests/site.pp
index e1ae22c..2c7afda 100644
--- a/manifests/site.pp
+++ b/manifests/site.pp
@@ -159,7 +159,7 @@
 #
 # [*service*]
 # Name of the server service to notify when certificates are updated.
-# Setting to `undef` will disable service notifications.
+# Setting to `null` will disable service notifications.
 # Optional value. Defaults:
 #   - 'httpd' for RedHat-based systems
 #   - 'apache2' for Debian-based, Suse-based, and Gentoo-based systems
diff --git a/metadata.json b/metadata.json
index 0bee98c..440984b 100644
--- a/metadata.json
+++ b/metadata.json
@@ -1,6 +1,6 @@
 {
   "name": "broadinstitute-certs",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "author": "Riccardo Calixte <rcalixte@broadinstitute.org>",
   "description": "Module for SSL certificate configuration",
   "summary": "Configures and manages SSL certificate deployments, restarting services as configured.",
@@ -62,7 +62,7 @@
   ],
   "dependencies": [
     { "name":"puppetlabs-stdlib","version_requirement":">= 4.12.0 < 5.0.0" },
-    { "name":"puppetlabs/concat","version_requirement":">= 1.1.1 < 3.0.0" }
+    { "name":"puppetlabs/concat","version_requirement":">= 1.1.1 < 5.0.0" }
   ],
   "requirements": [
     {