diff --git a/docs/admin/external-auth.md b/docs/admin/external-auth.md
index 4c1b205c1fe79..cab2cc0a5a3ce 100644
--- a/docs/admin/external-auth.md
+++ b/docs/admin/external-auth.md
@@ -108,6 +108,22 @@ CODER_EXTERNAL_AUTH_0_AUTH_URL="https://app.vssps.visualstudio.com/oauth2/author
 CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://app.vssps.visualstudio.com/oauth2/token"
 ```
 
+### GitLab self-managed
+
+GitLab self-managed requires the following environment variables:
+
+```env
+CODER_EXTERNAL_AUTH_0_ID="primary-gitlab"
+CODER_EXTERNAL_AUTH_0_TYPE=gitlab
+# This value is the "Application ID"
+CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
+CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
+CODER_EXTERNAL_AUTH_0_VALIDATE_URL="https://gitlab.company.org/oauth/token/info"
+CODER_EXTERNAL_AUTH_0_AUTH_URL="https://gitlab.company.org/oauth/authorize"
+CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://gitlab.company.org/oauth/token"
+CODER_EXTERNAL_AUTH_0_REGEX=gitlab\.company\.org
+```
+
 ### Self-managed git providers
 
 Custom authentication and token URLs should be used for self-managed Git