diff --git a/xmldoc/gpsbabel_man.xml b/xmldoc/gpsbabel_man.xml
index ce0757504..d4854a6d3 100644
--- a/xmldoc/gpsbabel_man.xml
+++ b/xmldoc/gpsbabel_man.xml
@@ -24,7 +24,7 @@
     <cmdsynopsis>
       <command>gpsbabel</command>
       <arg choice="opt">
-        <option>iofFxsh</option>
+        <option>-iofFxsh</option>
       </arg>
       <arg choice="opt" rep="repeat">file</arg>
     </cmdsynopsis>