diff --git a/README.md b/README.md
index a98989f..e9c53cc 100644
--- a/README.md
+++ b/README.md
@@ -44,3 +44,10 @@ try {
   process.exit()
 }
 ```
+
+## Refs
+
+- ubuntu version: https://releases.ubuntu.com/
+- playwright versions: https://github.com/microsoft/playwright/releases
+- playwright docker build files: https://github.com/microsoft/playwright/tree/main/utils/docker
+- playwright docker image tags: https://mcr.microsoft.com/en-us/artifact/mar/playwright/tags
diff --git a/ubuntu-22/Dockerfile b/ubuntu-22/Dockerfile
index 9c691cc..dbc3a24 100644
--- a/ubuntu-22/Dockerfile
+++ b/ubuntu-22/Dockerfile
@@ -1,6 +1,3 @@
-# https://github.com/microsoft/playwright/blob/main/utils/docker/Dockerfile.jammy
-# playwright version: https://github.com/microsoft/playwright/releases
-# ubuntu version: https://releases.ubuntu.com/
 ARG PLAYWRIGHT_VERSION
 FROM mcr.microsoft.com/playwright:v${PLAYWRIGHT_VERSION}-jammy
 
diff --git a/ubuntu-24/Dockerfile b/ubuntu-24/Dockerfile
index fc48a9d..5298d7b 100644
--- a/ubuntu-24/Dockerfile
+++ b/ubuntu-24/Dockerfile
@@ -1,6 +1,3 @@
-# https://github.com/microsoft/playwright/blob/main/utils/docker/Dockerfile.noble
-# playwright version: https://github.com/microsoft/playwright/releases
-# ubuntu version: https://releases.ubuntu.com/
 ARG PLAYWRIGHT_VERSION
 FROM mcr.microsoft.com/playwright:v${PLAYWRIGHT_VERSION}-noble