diff --git a/docs/docusaurus.md b/docs/docusaurus.md
index 3cd00c307..a700760d3 100644
--- a/docs/docusaurus.md
+++ b/docs/docusaurus.md
@@ -62,9 +62,9 @@ several steps:
   http://static.javadoc.io/
 
 The static website gets generated in the `website/build` directory. You can copy
-these files over to any static HTTP server to host your website. A simple `sbt docs/clean`
-will delete the previous folder since the `DocusaurusPlugin` will also bind it to the
-standard SBT `clean` task. 
+these files over to any static HTTP server to host your website. A simple
+`sbt docs/clean` will delete the previous folder since the `DocusaurusPlugin`
+will also bind it to the standard SBT `clean` task.
 
 ## Publish to GitHub pages locally
 
@@ -134,8 +134,8 @@ https://travis-ci.org/scalameta/mdoc/settings.
 
 Add the following values:
 
-- `GITHUB_DEPLOY_KEY` or `DEPLOY_KEY`: the base64 encoded secret key. Note, the secret key is
-  the file without the `.pub` extension
+- `GITHUB_DEPLOY_KEY` or `GIT_DEPLOY_KEY`: the base64 encoded secret key. Note,
+  the secret key is the file without the `.pub` extension
   ```sh
   # macOS
   cat myproject | base64 | pbcopy
@@ -184,7 +184,9 @@ docs 😎
 
 ## Include Scaladoc in site
 
-You can configure a project to include Scaladocs in its site. Below is an example configuration that uses [sbt-unidoc](https://github.com/sbt/sbt-unidoc) to aggregate Scaladocs across multiple projects.
+You can configure a project to include Scaladocs in its site. Below is an
+example configuration that uses [sbt-unidoc](https://github.com/sbt/sbt-unidoc)
+to aggregate Scaladocs across multiple projects.
 
 ```diff
  // build.sbt
@@ -202,9 +204,13 @@ You can configure a project to include Scaladocs in its site. Below is an exampl
    .dependsOn(myproject1, myproject2)
 ```
 
-Make sure that you've added the [sbt-unidoc](https://github.com/sbt/sbt-unidoc#how-to-add-this-plugin) dependency to `project/plugins.sbt`.
+Make sure that you've added the
+[sbt-unidoc](https://github.com/sbt/sbt-unidoc#how-to-add-this-plugin)
+dependency to `project/plugins.sbt`.
 
-Now the `docs/docusaurusCreateSite` command will generate Scaladocs in the `website/static/api` directory, which you'll probably want to add to your `.gitignore`:
+Now the `docs/docusaurusCreateSite` command will generate Scaladocs in the
+`website/static/api` directory, which you'll probably want to add to your
+`.gitignore`:
 
 ```diff
   // .gitignore
@@ -217,7 +223,8 @@ Now the `docs/docusaurusCreateSite` command will generate Scaladocs in the `webs
 + website/static/api
 ```
 
-You'll need to tweak your `siteConfig.js` file to make Docusaurus play nicely with Scaladoc's CSS. You may want to add a header link to your API docs too:
+You'll need to tweak your `siteConfig.js` file to make Docusaurus play nicely
+with Scaladoc's CSS. You may want to add a header link to your API docs too:
 
 ```diff
   // website/siteConfig.js
diff --git a/mdoc-sbt/src/main/scala/mdoc/DocusaurusPlugin.scala b/mdoc-sbt/src/main/scala/mdoc/DocusaurusPlugin.scala
index 7a21554ae..6358d12b6 100644
--- a/mdoc-sbt/src/main/scala/mdoc/DocusaurusPlugin.scala
+++ b/mdoc-sbt/src/main/scala/mdoc/DocusaurusPlugin.scala
@@ -54,9 +54,8 @@ object DocusaurusPlugin extends AutoPlugin {
     """|#!/usr/bin/env bash
        |
        |set -eu
-       |
+       |DEPLOY_KEY=${GIT_DEPLOY_KEY:-$GITHUB_DEPLOY_KEY}
        |set-up-ssh() {
-       |  KEY=$1
        |  echo "Setting up ssh..."
        |  mkdir -p $HOME/.ssh
        |  ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
@@ -64,18 +63,17 @@ object DocusaurusPlugin extends AutoPlugin {
        |  git config --global user.email "${MDOC_EMAIL:-mdoc@docusaurus}"
        |  git config --global push.default simple
        |  DEPLOY_KEY_FILE=$HOME/.ssh/id_rsa
-       |  echo "$KEY" | base64 --decode > ${DEPLOY_KEY_FILE}
+       |  echo "$DEPLOY_KEY" | base64 --decode > ${DEPLOY_KEY_FILE}
        |  chmod 600 ${DEPLOY_KEY_FILE}
        |  eval "$(ssh-agent -s)"
        |  ssh-add ${DEPLOY_KEY_FILE}
        |}
        |
-       | if [[ -n "${GITHUB_DEPLOY_KEY:-}" ]]; then
-       | set-up-ssh ${GITHUB_DEPLOY_KEY}
-       | elif [[ -n "${DEPLOY_KEY:-}" ]]; then
-       | echo "Using fallback env var DEPLOY_KEY."
-       | set-up-ssh ${DEPLOY_KEY}
-       | fi
+       |if [[ -n "${DEPLOY_KEY:-}" ]]; then
+       |  set-up-ssh
+       |else
+       |  echo "Can't setup SSH. To fix this problem, set the GIT_DEPLOY_KEY environment variable."
+       |fi
        |
        |yarn install
        |USE_SSH=true yarn publish-gh-pages