diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 8d8051b87e..15e8415482 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -811,7 +811,7 @@ BEGIN;
 INSERT INTO mytable VALUES(1);
 COMMIT;
 INSERT INTO mytable VALUES(2);
-SELECT 1/0;
+SELCT 1/0;<!-- this typo is intentional -->
 </programlisting>
      then none of the statements would get run, resulting in the visible
      difference that the first <command>INSERT</command> is not committed.