diff --git a/launch.sh b/launch.sh
index 5af7f93..f19343e 100755
--- a/launch.sh
+++ b/launch.sh
@@ -220,6 +220,7 @@ init() {
   fi
   cd "$PROJECT_DIR"
   # On Fedora 23: gcc postgresql-devel python3-devel python-virtualenv git-core python3-pip redhat-rpm-config gmp-devel
+  # On ArchLinux: base-devel postgresql-libs python python-virtualenv git python-pip
   sudo apt-get install -qq libpq-dev python3-dev python-virtualenv git-core python3-pip || error_and_quit "Dependancies installation failed."
   info "Dependancies via apt-get checked/installed."
   if ! test -d "$GISSMO_DIR/.git/"; then