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-rw-r--r--doc/spec/dir-spec.txt5
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diff --git a/doc/spec/dir-spec.txt b/doc/spec/dir-spec.txt
index 0743be313..139c51162 100644
--- a/doc/spec/dir-spec.txt
+++ b/doc/spec/dir-spec.txt
@@ -124,6 +124,11 @@ $Id$
Implementations MUST prefix items not recognized by older versions of Tor
with an "opt" until those versions of Tor are obsolete.
+ Other implementations that want to extend Tor's directory format MAY
+ introduce their own items. The keywords for extension items SHOULD start
+ with the characters "x-" or "X-", to guarantee that they will not conflict
+ with keywords used by future versions of Tor.
+
2. Router operation
ORs SHOULD generate a new router descriptor whenever any of the