diff --git a/README.md b/README.md
index 9719d75..f37d87a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 # GNS3 Docker appliances
 
-Appliances used to build GNS3 labs.
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+Appliances used to build GNS3 labs.
+
+This images are freely inspired from [Chewie's](https://github.com/Chewie/gns3-docker-appliances) ones
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diff --git a/router/Dockerfile b/router/Dockerfile
index 0566ff1..7455551 100644
--- a/router/Dockerfile
+++ b/router/Dockerfile
@@ -1,3 +1,5 @@
+# As CentOS reached EOL we cannot build the image anymore
+# So we reuse the work of Chewie for our own images
 FROM chewiebeardy/gns3-host:2023
 
 CMD ["/usr/sbin/init"]
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