diff --git a/appendices/dependencies.xml b/appendices/dependencies.xml
index 03eed010f..69232f239 100644
--- a/appendices/dependencies.xml
+++ b/appendices/dependencies.xml
@@ -2027,7 +2027,8 @@
         <segtitle>&external;</segtitle>
         <seglistitem>
           <seg>
-            <ulink url="&blfs-book;general/libseccomp.html">libseccomp</ulink>
+            <ulink url="&blfs-book;general/libseccomp.html">libseccomp</ulink> and
+            <ulink url="https://po4a.org/index.php.en">po4a</ulink>
           </seg>
         </seglistitem>
       </segmentedlist>