diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 836104fca6c..98db5f11b85 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1506,7 +1506,7 @@ SET ENABLE_SEQSCAN TO OFF;
      </varlistentry>
 
      <varlistentry id="guc-synchronous-commit" xreflabel="synchronous_commit">
-      <term><varname>synchronous_commit</varname> (<type>boolean</type>)</term>
+      <term><varname>synchronous_commit</varname> (<type>enum</type>)</term>
       <indexterm>
        <primary><varname>synchronous_commit</> configuration parameter</primary>
       </indexterm>