Index: alter_table.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v
retrieving revision 1.36
diff -c -r1.36 alter_table.sgml
*** alter_table.sgml	2002/02/16 23:45:48	1.36
--- alter_table.sgml	2002/02/17 10:32:59
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*** 295,300 ****
--- 295,309 ----
    </para>
   </refsect1>
  
+   <para> 
+    To add an automatically named primary key constraint to a table, noting
+    that a table can only ever have one primary key:
+    <programlisting>
+ ALTER TABLE distributors ADD PRIMARY KEY (dist_id);
+    </programlisting>
+   </para>
+  </refsect1>
+ 
   <refsect1 id="R1-SQL-ALTERTABLE-3">
    <title>
     Compatibility