add comments

templates/unifi-poller.rb.tmpl

@@ -22,6 +22,9 @@ class UnifiPoller < Formula
     cd bin_path do
       system "dep", "ensure"
       system "make", "install", "VERSION=#{version}", "PREFIX=#{prefix}", "ETC=#{etc}"
+      # If this fails, the user gets a nice big warning about write permissions on their
+      # [/usr/local/]var/log folder. The alternative could be letting the app silently
+      # fail to start when it cannot write logs. This is better. Fix perms; reinstall.
       system "mkdir", "-p", "#{var}/log/unifi-poller"
     end
   end