From e45b6f91e79010663c840ef8ca96a1548179af5d Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Mon, 26 Oct 2015 16:08:19 -0700
Subject: [PATCH] Document: Only auto-generate the excerpt if it's not
 overridden

Fixes #4061
---
 lib/jekyll/document.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index 46ff7e86..00a0ca7a 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -307,7 +307,7 @@ module Jekyll
       populate_tags
 
       if generate_excerpt?
-        data['excerpt'] = Jekyll::Excerpt.new(self)
+        data['excerpt'] ||= Jekyll::Excerpt.new(self)
       end
     end