diff --git a/man/ostree.repo-config.xml b/man/ostree.repo-config.xml
index 3fa02cac..5afeac8a 100644
--- a/man/ostree.repo-config.xml
+++ b/man/ostree.repo-config.xml
@@ -404,6 +404,17 @@ License along with this library. If not, see <https://www.gnu.org/licenses/>.
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><varname>bls-append-except-default</varname></term>
+        <listitem><para>A semicolon seperated string list of key-value pairs. For example:
+        <literal>bls-append-except-default=key1=value1;key2=value2</literal>. These key-value 
+        pairs will be injected into the generated BLS fragments of the non-default deployments.
+        In other words, the BLS fragment of the default deployment will be unaffected by
+        <literal>bls-append-except-default</literal>.
+        </para>
+        </listitem>
+      </varlistentry>
+
     </variablelist>
 
   </refsect1>