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-rw-r--r--doc/src/sgml/protocol.sgml5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index b115884acb3..e56eac8fd0f 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -537,6 +537,11 @@
The frontend should not respond to this message, but should
continue listening for a ReadyForQuery message.
</para>
+ <para>
+ The <productname>PostgreSQL</productname> server will always send this
+ message, but some third party backend implementations of the protocol
+ that don't support query cancellation are known not to.
+ </para>
</listitem>
</varlistentry>