diff --git a/docs/pages/auto-release.md b/docs/pages/auto-release.md
index dd222f1be..a11fba396 100644
--- a/docs/pages/auto-release.md
+++ b/docs/pages/auto-release.md
@@ -32,7 +32,7 @@ Options
   --no-version-prefix    Use the version as the tag without the 'v' prefix
   --jira string          Jira base URL
   --use-version          Version number to publish as. Defaults to reading from the package.json.
-  -s, --slack string     Post a message to slack about the release. Make sure the SLACK_TOKEN
+  -s, --slack            Post a message to slack about the release. Make sure the SLACK_TOKEN
                          environment variable is set.
 
 Global Options
diff --git a/src/cli/args.ts b/src/cli/args.ts
index 8efb056ae..7890a203b 100644
--- a/src/cli/args.ts
+++ b/src/cli/args.ts
@@ -349,7 +349,7 @@ const commands: ICommand[] = [
       {
         name: 'slack',
         alias: 's',
-        type: String,
+        type: Boolean,
         group: 'main',
         description:
           'Post a message to slack about the release. Make sure the SLACK_TOKEN environment variable is set.'