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-rw-r--r--Documentation/technical/protocol-capabilities.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/technical/protocol-capabilities.txt b/Documentation/technical/protocol-capabilities.txt
index eaab6b4ac7..8c4a0b90ca 100644
--- a/Documentation/technical/protocol-capabilities.txt
+++ b/Documentation/technical/protocol-capabilities.txt
@@ -275,3 +275,26 @@ to accept a signed push certificate, and asks the <nonce> to be
included in the push certificate. A send-pack client MUST NOT
send a push-cert packet unless the receive-pack server advertises
this capability.
+
+interesting-refs
+----------------
+
+For HTTP(S) servers only:
+
+Whether or not the upload-pack server advertises this capability,
+fetch-pack may send a "refspec" parameter in the query string of a
+fetch request. This capability indicates that such a parameter will
+be respected, in case the client cares.
+
+Whenever the receive-pack server gets that parameter, it will not
+advertise all refs and will instead only advertise refs that match
+those listed in the header. The parameter is a space-separated list of
+refs. A ref may optionally contain up to one wildcard.
+Advertisements will still respect hideRefs.
+
+The presence or absence of the "refspec" parameter does not affect
+what refs a client is permitted to fetch; this is still controlled in
+the normal fashion.
+
+This saves time in the presence of a large number of refs, because the
+client need not wait for the server to send the complete list of refs.