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diff --git a/lib/prune/plugins/davical.rb b/lib/prune/plugins/davical.rb
index f7f4b39..743356d 100644
--- a/lib/prune/plugins/davical.rb
+++ b/lib/prune/plugins/davical.rb
@@ -3,6 +3,11 @@ require 'pg'
 require 'prune/prune_plugin'
 require 'rm/plugins/davical'
 
+# Handle the pruning of DAViCal users from its database. This class
+# doesn't need to do anything; by inheriting from {DavicalRm}, we get
+# its {DavicalRm#remove_user} method and that's all we need to prune.
+#
 class DavicalPrune < DavicalRm
+  # Needed for the magic includers <tt>run()</tt> method.
   include PrunePlugin
 end