Add note deprecating use of consrc.

diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index 0b8ce3a479c8bf9bdc85d5773ea30bf767caf08a..ccfd756e171547682ec90ff88000086422fc0a84 100644 (file)
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -1357,6 +1357,15 @@
    </tgroup>
   </table>
 
+  <note>
+   <para>
+    <structfield>consrc</structfield> is not updated when referenced objects
+    change; for example, it won't track renaming of columns.  Rather than
+    relying on this field, it's best to use <function>pg_get_constraintdef()</>
+    to extract the definition of a check constraint.
+   </para>
+  </note>
+
   <note>
    <para>
     <literal>pg_class.relchecks</literal> needs to agree with the