diff --git a/docs/_data/config_options/serve.yml b/docs/_data/config_options/serve.yml
index fc254488..3d786f6e 100644
--- a/docs/_data/config_options/serve.yml
+++ b/docs/_data/config_options/serve.yml
@@ -34,6 +34,7 @@
 
 - name: Live reload port
   description: Port for LiveReload to listen on.
+  option: "livereload_port: PORT"
   flag: "--livereload-port PORT"
 
 
diff --git a/lib/jekyll/commands/serve.rb b/lib/jekyll/commands/serve.rb
index e54542ff..e019d99a 100644
--- a/lib/jekyll/commands/serve.rb
+++ b/lib/jekyll/commands/serve.rb
@@ -71,7 +71,6 @@ module Jekyll
             end
 
             cmd.action do |_, opts|
-              opts["livereload_port"] ||= LIVERELOAD_PORT
               opts["serving"] = true
               opts["watch"]   = true unless opts.key?("watch")
 
@@ -94,6 +93,7 @@ module Jekyll
           opts = configuration_from_options(opts)
           destination = opts["destination"]
           if opts["livereload"]
+            opts["livereload_port"] ||= LIVERELOAD_PORT
             validate_options(opts)
             register_reload_hooks(opts)
           end