diff --git a/guide/exporting.md b/guide/exporting.md
index 705e0a07..105e7889 100644
--- a/guide/exporting.md
+++ b/guide/exporting.md
@@ -131,6 +131,24 @@ This command also accept multiple entries like for the [export command](#multipl
 
 See [Static Hosting](/guide/hosting).
 
+## Exportable docker image
+
+To support the export feature, there is a bigger docker image with tag **playwright**. Just run following command in your work folder:
+
+```bash
+docker run --name slidev --rm -it \
+    -v ${PWD}:/slidev \
+    -p 3030:3030 \
+    -e NPM_MIRROR="https://registry.npmmirror.com" \
+    tangramor/slidev:playwright
+```
+
+Then you can use the export feature like following under your work folder:
+
+```bash
+docker exec -i slidev npx slidev export --timeout 2m --output slides.pdf
+```
+
 ## Troubleshooting
 
 ### Timeout
diff --git a/guide/install.md b/guide/install.md
index ff78ed75..d30f19f3 100644
--- a/guide/install.md
+++ b/guide/install.md
@@ -69,10 +69,13 @@ docker run --name slidev --rm -it \
     --user node \
     -v ${PWD}:/slidev \
     -p 3030:3030 \
+    -e NPM_MIRROR="https://registry.npmmirror.com" \
     tangramor/slidev:latest
 ```
 
-If your work folder is empty, it will generate a template `slides.md` and other related files under your work folder, and launch the server on port `3030`.
+***Note***: You can use `NPM_MIRROR` to specify a npm mirror to speed up the installation process.
+
+If your work folder is empty, it will generate a template `slides.md` and other related files under your work folder, and launch the server on port `3030`. 
 
 You can access your slides from `http://localhost:3030/`
 
@@ -119,6 +122,7 @@ Or create a static image with following Dockerfile:
 FROM nginx:alpine
 
 COPY dist /usr/share/nginx/html
+
 ```
 
 Create the docker image: `docker build -t mystaticppt .`