diff --git a/config.yml b/config.yml
index 3e739b8..dd89378 100644
--- a/config.yml
+++ b/config.yml
@@ -1,3 +1,4 @@
+# This is a YAML file, more abouts its syntax: https://en.wikipedia.org/wiki/YAML
 namespaces:
 - o
 - en