mention secondary RP instance
@@ -89,7 +89,9 @@ Keep in mind that every time you restart the machine, the contents of the
``tmpfs`` file system will be lost. This means that Routinator will have to
rebuild its cache from scratch. This is not a problem, other than it having to
download several gigabytes of data, which usually takes about ten minutes to
-complete.
+complete. During this time the API and user interface will be unavailable, as
+well as the RTR server. Your routers should be configured have a secondary
+relying party instance available at all times.
Platform Specific Instructions
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