diff --git a/doc/chromium.md b/doc/chromium.md
index 4c2bbd1..592f1d6 100644
--- a/doc/chromium.md
+++ b/doc/chromium.md
@@ -1,3 +1,4 @@
+# refer
 1. install vaapi vdpau package:
     archlinux
     ```sh
@@ -8,3 +9,11 @@
   - chrome://flags/#enable-accelerated-video-decode
 3. verification
   - chrome://gpu
+
+# references
+
+- [How To Enable Hardware Accelerated Video Decode In Google Chrome, Brave, Vivaldi And Opera Browsers On Debian, Ubuntu Or Linux Mint - Linux Uprising Blog](https://www.linuxuprising.com/2021/01/how-to-enable-hardware-accelerated.html)
+
+```
+google-chrome-stable --use-gl=desktop --enable-features=VaapiVideoDecoder
+```
diff --git a/doc/golang.md b/doc/golang.md
new file mode 100644
index 0000000..98a7dce
--- /dev/null
+++ b/doc/golang.md
@@ -0,0 +1,6 @@
+# Debugging
+- debug a specific test-case
+```sh
+dlv test --build-flags='path/to/module' -- -test.run ^TestFunctionName$
+```
+