Merge pull request #60 from tech234a/patch-1

Add unvote time limits

README.md

@@ -21,6 +21,7 @@ _This list has no affiliation with Hacker News, Y Combinator, or any YC-backed c
     - [Flame-War Detector](#flame-war-detector)
     - [Second-Chance Pool](#second-chance-pool)
     - [Edit/Delete Time Limits](#editdelete-time-limits)
+    - [Unvote Time Limits](#unvote-time-limits)
     - [Comment Collapsing](#comment-collapsing)
     - [Shadowbanning](#shadowbanning)
     - [Hidden Reply Links](#hidden-reply-links)
@@ -109,6 +110,9 @@ Moderators can change the title of a submission at any time.
 
 If you need something deleted but you can't, you'll have to message [hn@ycombinator.com](mailto:hn@ycombinator.com).
 
+### Unvote Time Limits
+After a user votes on a post or comment, it can be unvoted [**within 1 hour**](https://news.ycombinator.com/item?id=12073806). After that time, the vote becomes permanent.
+
 ### Comment Collapsing
 
 Comments can be collapsed by clicking the `[+]` icon to improve readability.`[flagged]` comments are sometimes collapsed by default, and moderators can set a comment to automatically be collapsed if necessary (e.g. meta-discussion).