diff --git a/doc/src/sgml/client-auth.sgml b/doc/src/sgml/client-auth.sgml
index 1e456e77969..fd26beb5e98 100644
--- a/doc/src/sgml/client-auth.sgml
+++ b/doc/src/sgml/client-auth.sgml
@@ -1751,7 +1751,7 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
     <literal>user name</literal>, <literal>password</literal> (encrypted) and
     <literal>NAS Identifier</literal>. The request will be encrypted using
     a secret shared with the server. The RADIUS server will respond to
-    this server with either <literal>Access Accept</literal> or
+    this request with either <literal>Access Accept</literal> or
     <literal>Access Reject</literal>. There is no support for RADIUS accounting.
    </para>
 
@@ -1760,11 +1760,11 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
     be tried sequentially. If a negative response is received from
     a server, the authentication will fail. If no response is received,
     the next server in the list will be tried. To specify multiple
-    servers, put the names within quotes and separate the server names
-    with a comma. If multiple servers are specified, all other RADIUS
-    options can also be given as a comma separate list, to apply
-    individual values to each server. They can also be specified as
-    a single value, in which case this value will apply to all servers.
+    servers, separate the server names with commas and surround the list
+    with double quotes. If multiple servers are specified, the other
+    RADIUS options can also be given as comma-separated lists, to provide
+    individual values for each server. They can also be specified as
+    a single value, in which case that value will apply to all servers.
    </para>
 
    <para>
@@ -1774,7 +1774,7 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
        <term><literal>radiusservers</literal></term>
        <listitem>
         <para>
-         The name or IP addresses of the RADIUS servers to connect to.
+         The DNS names or IP addresses of the RADIUS servers to connect to.
          This parameter is required.
         </para>
        </listitem>
@@ -1785,7 +1785,7 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
        <listitem>
         <para>
          The shared secrets used when talking securely to the RADIUS
-         server. This must have exactly the same value on the PostgreSQL
+         servers. This must have exactly the same value on the PostgreSQL
          and RADIUS servers. It is recommended that this be a string of
          at least 16 characters. This parameter is required.
          <note>
@@ -1805,8 +1805,9 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
        <term><literal>radiusports</literal></term>
        <listitem>
         <para>
-         The port number on the RADIUS servers to connect to. If no port
-         is specified, the default port <literal>1812</literal> will be used.
+         The port numbers to connect to on the RADIUS servers. If no port
+         is specified, the default RADIUS port (<literal>1812</literal>)
+         will be used.
         </para>
        </listitem>
       </varlistentry>
@@ -1815,10 +1816,10 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
        <term><literal>radiusidentifiers</literal></term>
        <listitem>
         <para>
-         The string used as <literal>NAS Identifier</literal> in the RADIUS
-         requests. This parameter can be used as a second parameter
-         identifying for example which database user the user is attempting
-         to authenticate as, which can be used for policy matching on
+         The strings to be used as <literal>NAS Identifier</literal> in the
+         RADIUS requests. This parameter can be used, for example, to
+         identify which database cluster the user is attempting to connect
+         to, which can be useful for policy matching on
          the RADIUS server. If no identifier is specified, the default
          <literal>postgresql</literal> will be used.
         </para>
@@ -1827,6 +1828,16 @@ host ... ldap ldapserver=ldap.example.net ldapbasedn="dc=example, dc=net" ldapse
 
      </variablelist>
    </para>
+
+   <para>
+    If it is necessary to have a comma or whitespace in a RADIUS parameter
+    value, that can be done by putting double quotes around the value, but
+    it is tedious because two layers of double-quoting are now required.
+    An example of putting whitespace into RADIUS secret strings is:
+<programlisting>
+host ... radius radiusservers="server1,server2" radiussecrets="""secret one"",""secret two"""
+</programlisting>
+   </para>
   </sect1>
 
   <sect1 id="auth-cert">
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 0129dd24d05..95569cf8788 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1881,7 +1881,7 @@ parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline,
 
 		REQUIRE_AUTH_OPTION(uaRADIUS, "radiusservers", "radius");
 
-		if (!SplitIdentifierString(dupval, ',', &parsed_servers))
+		if (!SplitGUCList(dupval, ',', &parsed_servers))
 		{
 			/* syntax error in list */
 			ereport(elevel,
@@ -1930,7 +1930,7 @@ parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline,
 
 		REQUIRE_AUTH_OPTION(uaRADIUS, "radiusports", "radius");
 
-		if (!SplitIdentifierString(dupval, ',', &parsed_ports))
+		if (!SplitGUCList(dupval, ',', &parsed_ports))
 		{
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
@@ -1965,7 +1965,7 @@ parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline,
 
 		REQUIRE_AUTH_OPTION(uaRADIUS, "radiussecrets", "radius");
 
-		if (!SplitIdentifierString(dupval, ',', &parsed_secrets))
+		if (!SplitGUCList(dupval, ',', &parsed_secrets))
 		{
 			/* syntax error in list */
 			ereport(elevel,
@@ -1987,7 +1987,7 @@ parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline,
 
 		REQUIRE_AUTH_OPTION(uaRADIUS, "radiusidentifiers", "radius");
 
-		if (!SplitIdentifierString(dupval, ',', &parsed_identifiers))
+		if (!SplitGUCList(dupval, ',', &parsed_identifiers))
 		{
 			/* syntax error in list */
 			ereport(elevel,