diff --git a/src/General/Index.coffee b/src/General/Index.coffee
index 6b87615a7..4ec9f7f4d 100644
--- a/src/General/Index.coffee
+++ b/src/General/Index.coffee
@@ -639,6 +639,14 @@ Index =
           b = num[num.length - 1] if (num = b.last_replies)
           b.no - a.no
         ).map (post) -> post.no
+      when 'lastlong'
+        lastlong = (thread) ->
+          for r, i in (thread.last_replies or []) by -1
+            return r if r.com and Build.parseComment(r.com).replace(/[^a-z]/ig, '').length >= 100
+          thread
+        [liveThreadData...].sort((a, b) ->
+          lastlong(b).no - lastlong(a).no
+        ).map (post) -> post.no
       when 'bump'       then liveThreadIDs
       when 'birth'      then [liveThreadIDs... ].sort (a, b) -> b - a
       when 'replycount' then [liveThreadData...].sort((a, b) -> b.replies - a.replies).map (post) -> post.no
diff --git a/src/General/Index/NavLinks.html b/src/General/Index/NavLinks.html
index 9cd830b41..90d1794fc 100644
--- a/src/General/Index/NavLinks.html
+++ b/src/General/Index/NavLinks.html
@@ -17,6 +17,7 @@
   <option disabled>Index Sort</option>
   <option value="bump">Bump order</option>
   <option value="lastreply">Last reply</option>
+  <option value="lastlong">Last long reply</option>
   <option value="birth">Creation date</option>
   <option value="replycount">Reply count</option>
   <option value="filecount">File count</option>