diff --git a/circle.yml b/circle.yml
index 74a5bc4..f9ff53a 100644
--- a/circle.yml
+++ b/circle.yml
@@ -12,8 +12,10 @@ dependencies:
       exo-utils
       libdbus-glib-1-dev
       gnome-common
+    # use the repository from xenial to get libwebkit2gtk-4.0-dev
     - sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial main universe"
     - sudo apt-get update
+    # ignore the error during the installation
     - sudo DEBIAN_FRONTEND=noninteractive apt-get install -y libwebkit2gtk-4.0-dev || true
 
 test: