diff --git a/wiki/manifests/init.pp b/wiki/manifests/init.pp
index 3e41f73..67bee7e 100644
--- a/wiki/manifests/init.pp
+++ b/wiki/manifests/init.pp
@@ -1,3 +1,10 @@
+# Install MoinMoin.
+#
+# === Global variables
+#
+#   $wiki_moin_version:
+#       MoinMoin version number.
+#
 class wiki::moin {
 
     if !$wiki_moin_version {
@@ -34,9 +41,16 @@ class wiki::moin {
 }
 
 
+# Fetch graphingwiki from svn.
+#
+# === Global variables
+#
+#   $wiki_gwiki_revision:
+#       Graphingwiki revision.
+#
 class wiki::graphingwiki::common {
 
-    if !$wiki_gwiki_revision {
+    if !$wiki_graphingwiki_revision {
         fail("\$wiki_graphingwiki_revision must be set.")
     }
 
@@ -49,6 +63,8 @@ class wiki::graphingwiki::common {
 }
 
 
+# Install Graphingwiki.
+#
 class wiki::graphingwiki inherits wiki::graphingwiki::common {
 
     python::setup::install { "/usr/local/src/graphingwiki/graphingwiki":
@@ -58,6 +74,8 @@ class wiki::graphingwiki inherits wiki::graphingwiki::common {
 }
 
 
+# Install Opencollab.
+#
 class wiki::opencollab inherits wiki::graphingwiki::common {
 
     python::setup::install { "/usr/local/src/graphingwiki/opencollab":
@@ -67,6 +85,8 @@ class wiki::opencollab inherits wiki::graphingwiki::common {
 }
 
 
+# Install collab.
+#
 class wiki::collab inherits wiki::graphingwiki::common {
 
     python::setup::install { "/usr/local/src/graphingwiki/collab":
@@ -76,6 +96,16 @@ class wiki::collab inherits wiki::graphingwiki::common {
 }
 
 
+# Configure collab server.
+#
+# === Global variables
+#
+#   $wiki_datadir:
+#       Directory for wiki data. Defaults to /srv/wikis.
+#
+#   $wiki_collab_fqdn:
+#       FQDN of collab virtual host. Defaults to $homename.
+#
 class wiki::collab::base {
 
     include cairo::python