doc/protocol.rst: mention song id lifetime

b2d89253 · naglis · Max Kellermann · 50c1e373 · b2d89253
Commit b2d89253 authored Nov 16, 2023 by naglis Committed by Max Kellermann Dec 20, 2023
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--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -691,7 +691,8 @@ Song ids on the other hand are stable: an id is assigned to a song
 when it is added, and will stay the same, no matter how much it is
 moved around.  Adding the same song twice will assign different ids to
 them, and a deleted-and-readded song will have a new id.  This way, a
-client can always be sure the correct song is being used.
+client can always be sure the correct song is being used.  Song ids are not
+preserved across :program:`MPD` restarts.

 Many commands come in two flavors, one for each address type.
 Whenever possible, ids should be used.