diff --git a/lib/slack/lookups.ex b/lib/slack/lookups.ex
index c568907..301f6c7 100644
--- a/lib/slack/lookups.ex
+++ b/lib/slack/lookups.ex
@@ -86,13 +86,14 @@ defmodule Slack.Lookups do
   @doc ~S"""
   Turns a Slack channel ID (`"C…"`) into a string in the format "#CHANNEL_NAME".
   """
+  def lookup_channel_name(channel_id, slack)
+
+  # Slack channel ID's (`"C…"`)
   def lookup_channel_name(channel_id = "C" <> _id, slack) do
     "#" <> slack.channels[channel_id].name
   end
 
-  @doc ~S"""
-  Turns a Slack private channel ID (`"G…"`) into a string in the format "#CHANNEL_NAME".
-  """
+  # Private channel ID's (`"G…"`)
   def lookup_channel_name(channel_id = "G" <> _id, slack) do
     "#" <> slack.groups[channel_id].name
   end