diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 85705e9..42167d8 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -720,7 +720,7 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable>
      </varlistentry>
 
      <varlistentry>
-      <term><replaceable class="PARAMETER">type</replaceable></term>
+      <term><replaceable class="PARAMETER">data_type</replaceable></term>
       <listitem>
        <para>
         Data type of the new column, or new data type for an existing