2 files changed, 33 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/alter_function.sgml b/doc/src/sgml/ref/alter_function.sgml
index d8747e0748..03ffa5945a 100644
--- a/doc/src/sgml/ref/alter_function.sgml
+++ b/doc/src/sgml/ref/alter_function.sgml
@@ -40,6 +40,7 @@ ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="param
     PARALLEL { UNSAFE | RESTRICTED | SAFE }
     COST <replaceable class="parameter">execution_cost</replaceable>
     ROWS <replaceable class="parameter">result_rows</replaceable>
+    SUPPORT <replaceable class="parameter">support_function</replaceable>
     SET <replaceable class="parameter">configuration_parameter</replaceable> { TO | = } { <replaceable class="parameter">value</replaceable> | DEFAULT }
     SET <replaceable class="parameter">configuration_parameter</replaceable> FROM CURRENT
     RESET <replaceable class="parameter">configuration_parameter</replaceable>
@@ -248,6 +249,24 @@ ALTER FUNCTION <replaceable>name</replaceable> [ ( [ [ <replaceable class="param
      </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><literal>SUPPORT</literal> <replaceable class="parameter">support_function</replaceable></term>
+
+    <listitem>
+     <para>
+      Set or change the planner support function to use for this function.
+      See <xref linkend="xfunc-optimization"/> for details.  You must be
+      superuser to use this option.
+     </para>
+
+     <para>
+      This option cannot be used to remove the support function altogether,
+      since it must name a new support function.  Use <command>CREATE OR
+      REPLACE FUNCTION</command> if you need to do that.
+     </para>
+    </listitem>
+   </varlistentry>
+
      <varlistentry>
       <term><replaceable>configuration_parameter</replaceable></term>
       <term><replaceable>value</replaceable></term>
diff --git a/doc/src/sgml/ref/create_function.sgml b/doc/src/sgml/ref/create_function.sgml
index 4072543184..dd6a2f7304 100644
--- a/doc/src/sgml/ref/create_function.sgml
+++ b/doc/src/sgml/ref/create_function.sgml
@@ -33,6 +33,7 @@ CREATE [ OR REPLACE ] FUNCTION
     | PARALLEL { UNSAFE | RESTRICTED | SAFE }
     | COST <replaceable class="parameter">execution_cost</replaceable>
     | ROWS <replaceable class="parameter">result_rows</replaceable>
+    | SUPPORT <replaceable class="parameter">support_function</replaceable>
     | SET <replaceable class="parameter">configuration_parameter</replaceable> { TO <replaceable class="parameter">value</replaceable> | = <replaceable class="parameter">value</replaceable> | FROM CURRENT }
     | AS '<replaceable class="parameter">definition</replaceable>'
     | AS '<replaceable class="parameter">obj_file</replaceable>', '<replaceable class="parameter">link_symbol</replaceable>'
@@ -478,6 +479,19 @@ CREATE [ OR REPLACE ] FUNCTION
     </varlistentry>
 
     <varlistentry>
+     <term><literal>SUPPORT</literal> <replaceable class="parameter">support_function</replaceable></term>
+
+     <listitem>
+      <para>
+       The name (optionally schema-qualified) of a <firstterm>planner support
+       function</firstterm> to use for this function.  See
+       <xref linkend="xfunc-optimization"/> for details.
+       You must be superuser to use this option.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry>
      <term><replaceable>configuration_parameter</replaceable></term>
      <term><replaceable>value</replaceable></term>
      <listitem>