diff --git a/roles/lmn_fvs/tasks/main.yml b/roles/lmn_fvs/tasks/main.yml
index 9b4e081..50377ab 100644
--- a/roles/lmn_fvs/tasks/main.yml
+++ b/roles/lmn_fvs/tasks/main.yml
@@ -35,6 +35,7 @@
       - gitk
       - htop
       - jupyter
+      - kchmviewer
       - kdevelop
       - kdevelop-php
       - kdevelop-python
@@ -55,6 +56,7 @@
       - net-tools
       - netcat-openbsd
       - nmap
+      - okular-extra-backends ## needed for CHM files
       - pdf-presenter-console
       - php-cli
       - pipx