diff --git a/config.yaml b/config.yaml
index fd57211..e89628c 100644
--- a/config.yaml
+++ b/config.yaml
@@ -13,7 +13,7 @@ options:
     type: string
     default: "https://nexus.opendaylight.org/content/groups/public/org/opendaylight/integration/distribution-karaf/0.2.2-Helium-SR2/distribution-karaf-0.2.2-Helium-SR2.tar.gz"
     description: |
-      Web addressable location of OpenDayLight binaries to install.
+      Web addressable location of OpenDayLight binaries to install
 
       If unset, the charm will install binaries from the opendaylight-karaf
       package.
@@ -21,7 +21,10 @@ options:
     type: string
     description: |
       Package sources to install. Can be used to specify where to isntall the
-      opendaylight-karaf package from.
+      opendaylight-karaf package from
+  install-keys:
+    type: string
+    description: Apt keys for package install sources
   http-proxy:
     type: string
     default:
diff --git a/hooks/odl_controller_hooks.py b/hooks/odl_controller_hooks.py
index 916c475..5c2aae9 100755
--- a/hooks/odl_controller_hooks.py
+++ b/hooks/odl_controller_hooks.py
@@ -53,7 +53,7 @@ def controller_api_joined(r_id=None):
 @hooks.hook()
 def install():
     if config["install-sources"]:
-        configure_sources(update=True, install_key="install_sources")
+        configure_sources(update=True, sources_var="install_sources")
 
     # install packages
     apt_install(PACKAGES, fatal=True)