add a little docblock explaining about it
diff --git a/plugins/available/_xterm.plugins.bash b/plugins/available/_xterm.plugins.bash
index 3e4ac9e..9c8c668 100644
--- a/plugins/available/_xterm.plugins.bash
+++ b/plugins/available/_xterm.plugins.bash
@@ -1,3 +1,11 @@
+# This plugin is known to cause issues on OS X with the evaluation of
+# colors. Please read [issue 108] for more information.
+#
+# You can manually turn this on by symlinking it into your
+# plugins/enabled/ directory.
+#
+# [issue 108]: https://github.com/revans/bash-it/issues/108
+
set_xterm_title () {
local title="$1"
echo -ne "\e]0;$title\007"