diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 9aa9b28..53059d5 100644
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -60,7 +60,7 @@
 
       <row>
        <entry><type>bit varying [ (<replaceable>n</replaceable>) ]</type></entry>
-       <entry><type>varbit</type></entry>
+       <entry><type>varbit [ (<replaceable>n</replaceable>) ]</type></entry>
        <entry>variable-length bit string</entry>
       </row>