diff --git a/md-to-pdf b/md-to-pdf
index e9bddde..886906f 100755
--- a/md-to-pdf
+++ b/md-to-pdf
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 SCRIPT_TITLE=md-to-pdf
-depends=(chromium cmark-gfm)
-optdepends=()
+depends=(chromium cmark-gfm)  # 'chromium' is e.g. provided by the package 'ungoogled-chromium'
+optdepends=(notify-send)
 
 # Uncomment for debugging:
 exec 1> "${HOME}"/"${SCRIPT_TITLE}".log 2>&1