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diff --git a/doc/userdata.txt b/doc/userdata.txt
index 00c16b25..cc691ae6 100644
--- a/doc/userdata.txt
+++ b/doc/userdata.txt
@@ -36,6 +36,16 @@ finds. However, certain types of user-data are handled specially.
will be passed through this same set of rules. Ie, the content
read from the URL can be gzipped, mime-multi-part, or plain text
+* Include File Once
+ begins with #include-once or Content-Type: text/x-include-once-url
+ This content is a "include" file. The file contains a list of
+ urls, one per line. Each of the URLs will be read, and their content
+ will be passed through this same set of rules. Ie, the content
+ read from the URL can be gzipped, mime-multi-part, or plain text
+ This file will just be downloaded only once per instance, and its
+ contents cached for subsequent boots. This allows you to pass in
+ one-time-use or expiring URLs.
+
* Cloud Config Data
begins with #cloud-config or Content-Type: text/cloud-config