diff --git a/Dockerfile.in b/Dockerfile.in
index 9027c3b..d227e27 100644
--- a/Dockerfile.in
+++ b/Dockerfile.in
@@ -19,6 +19,7 @@ RUN apt-get update \
     && apt-get -y install \
         ca-certificates \
         coreutils \
+        socat \
         git \
         openssh-client \
     && rm -rf /var/lib/apt/lists/*
diff --git a/docs/proxy.md b/docs/proxy.md
new file mode 100644
index 0000000..b372dd8
--- /dev/null
+++ b/docs/proxy.md
@@ -0,0 +1,48 @@
+# Using git with proxy
+
+Git-sync supports using a proxy through git-configuration.
+
+## Background
+
+See [issue 180](https://github.com/kubernetes/git-sync/issues/180) for a background.
+See [Github documentation](https://docs.github.com/en/github/authenticating-to-github/using-ssh-over-the-https-port) specifically for GitHub.
+Lastly, [see similar issue for FluxCD](https://github.com/fluxcd/flux/pull/3152) for configuration.
+
+## Step 1: Create configuration
+
+Create a ConfigMap to store your configuration:
+
+```bash
+cat << EOF >> /tmp/ssh-config
+Host github.com
+    ProxyCommand socat STDIO PROXY:<proxyIP>:%h:%p,proxyport=<proxyport>,proxyauth=<proxyAuth>
+    User git
+    Hostname ssh.github.com
+    Port 443
+    IdentityFile /etc/git-secret/ssh
+EOF
+
+kubectl create configmap ssh-config --from-file=ssh-config=/tmp/ssh-config
+```
+
+then mount this under `~/.ssh/config`, typically `/tmp/.ssh/config`:
+
+```yaml
+...
+apiVersion: v1
+kind: Pod
+...
+spec:
+  containers:
+    - name: git-sync
+      ...
+      volumeMounts:
+        - name: ssh-config
+          mountPath: /tmp/.ssh/config
+          readOnly: true
+          subPath: ssh-config
+  volumes:
+    - name: ssh-config
+      configMap:
+        name: ssh-config
+```
\ No newline at end of file