diff --git a/packages.ini b/packages.ini
index 8788f6f73..f939ee4a3 100644
--- a/packages.ini
+++ b/packages.ini
@@ -40,7 +40,7 @@ xmlstarlet = buster, bionic
 [unknown]
 # TODO: Triage all these package to know whether they are still
 #       used or if they are installed by other packages.
-build-essential = bionic
+build-essential = bionic # Maybe related to libffi, libpq and libssl below.
 coreutils = buster, bionic
 flac = buster, bionic
 lame = buster, bionic # Maybe liquidsoap-plugin-lame, but it uses a library not the lame binary