diff --git a/docs/users_guide/flags.xml b/docs/users_guide/flags.xml
index 43960ec620f6d493f870a9939ea4ecc4e172911d..6b8b17c3f6b0b854de9624fdd5f3ee34e2d63c19 100644
--- a/docs/users_guide/flags.xml
+++ b/docs/users_guide/flags.xml
@@ -30,7 +30,7 @@
             <entry>-</entry>
           </row>
           <row>
-            <entry><option>-help</option></entry>
+            <entry><option>--help</option></entry>
             <entry>help</entry>
             <entry>mode</entry>
             <entry>-</entry>