diff --git a/doc/src/sgml/ref/create_external_table.sgml b/doc/src/sgml/ref/create_external_table.sgml
index d18a8734358..798b9a077cd 100755
--- a/doc/src/sgml/ref/create_external_table.sgml
+++ b/doc/src/sgml/ref/create_external_table.sgml
@@ -145,7 +145,7 @@ CREATE WRITABLE EXTERNAL WEB [TEMPORARY | TEMP] TABLE table_name
   
   <para>
     You may specify multiple external data sources or URIs (uniform resource identifiers) 
-    with the <literal>LOCATION</literal> clause � up to the number of primary segment instances 
+    with the <literal>LOCATION</literal> clause — up to the number of primary segment instances 
     in your Apache Cloudberry array. Each URI points to an external data file or other data 
     source. These URIs do not need to exist prior to defining an external table (<command>CREATE EXTERNAL TABLE</command> 
     does not validate the URIs specified). However you will get an error if they cannot be found 
@@ -159,7 +159,7 @@ CREATE WRITABLE EXTERNAL WEB [TEMPORARY | TEMP] TABLE table_name
   </para>
   
   <para>
-    gpfdist � If using the <literal>gpfdist://</literal> protocol, you must have the 
+    gpfdist — If using the <literal>gpfdist://</literal> protocol, you must have the 
     Cloudberry file distribution program (<literal>gpfdist</literal>) running on the host where the external 
     data files reside. This program points to a given directory on the file host and 
     serves external data files to all Apache Cloudberry segments in parallel. 
@@ -169,7 +169,7 @@ CREATE WRITABLE EXTERNAL WEB [TEMPORARY | TEMP] TABLE table_name
   </para>
   
   <para>
-    file � If using the <literal>file://</literal> protocol the external data file(s) 
+    file — If using the <literal>file://</literal> protocol the external data file(s) 
     must reside on a segment host in a location accessible by the Cloudberry super user 
     (gpadmin). The number of URIs specified corresponds to the number of segment 
     instances that will work in parallel to access the external table. So for 
@@ -184,7 +184,7 @@ CREATE WRITABLE EXTERNAL WEB [TEMPORARY | TEMP] TABLE table_name
   </para>
   
   <para>
-    http � If using the <literal>http://</literal> protocol the external data file(s) 
+    http — If using the <literal>http://</literal> protocol the external data file(s) 
     must reside on a web server that is accessible by the Cloudberry segment hosts. 
     The number of URIs specified corresponds to the number of segment instances 
     that will work in parallel to access the external table. So for example,