diff --git a/inc/api.php b/inc/api.php
index b2d8adec..b280c25b 100644
--- a/inc/api.php
+++ b/inc/api.php
@@ -32,6 +32,7 @@ class Api {
 			'images' => 'images',
 			'sticky' => 'sticky',
 			'locked' => 'locked',
+			'cycle' => 'cyclical',
 			'bump' => 'last_modified',
 			'embed' => 'embed',
 		);
diff --git a/inc/config.php b/inc/config.php
index 3fdb8d2f..82fdc882 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -1245,6 +1245,8 @@
 	$config['mod']['link_bumpunlock'] = '[-Sage]';
 	$config['mod']['link_editpost'] = '[Edit]';
 	$config['mod']['link_move'] = '[Move]';
+	$config['mod']['link_cycle'] = '[Cycle]';
+	$config['mod']['link_uncycle'] = '[-Cycle]';
 
 	// Moderator capcodes.
 	$config['capcode'] = ' <span class="capcode">## %s</span>';
@@ -1388,6 +1390,9 @@
 	$config['mod']['deletebyip_global'] = ADMIN;
 	// Sticky a thread
 	$config['mod']['sticky'] = MOD;
+	// Cycle a thread
+	$config['mod']['cycle'] = MOD;
+	$config['cycle_limit'] = &$config['reply_limit'];
 	// Lock a thread
 	$config['mod']['lock'] = MOD;
 	// Post in a locked thread
diff --git a/inc/functions.php b/inc/functions.php
index e9692d56..1bd1f32f 100755
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -1021,7 +1021,7 @@ function insertFloodPost(array $post) {
 
 function post(array $post) {
 	global $pdo, $board;
-	$query = prepare(sprintf("INSERT INTO ``posts_%s`` VALUES ( NULL, :thread, :subject, :email, :name, :trip, :capcode, :body, :body_nomarkup, :time, :time, :files, :num_files, :filehash, :password, :ip, :sticky, :locked, 0, :embed, :slug)", $board['uri']));
+	$query = prepare(sprintf("INSERT INTO ``posts_%s`` VALUES ( NULL, :thread, :subject, :email, :name, :trip, :capcode, :body, :body_nomarkup, :time, :time, :files, :num_files, :filehash, :password, :ip, :sticky, :locked, :cycle, 0, :embed, :slug)", $board['uri']));
 
 	// Basic stuff
 	if (!empty($post['subject'])) {
@@ -1061,6 +1061,12 @@ function post(array $post) {
 		$query->bindValue(':locked', false, PDO::PARAM_INT);
 	}
 
+	if ($post['op'] && $post['mod'] && isset($post['cycle']) && $post['cycle']) {
+		$query->bindValue(':cycle', true, PDO::PARAM_INT);
+	} else {
+		$query->bindValue(':cycle', false, PDO::PARAM_INT);
+	}
+
 	if ($post['mod'] && isset($post['capcode']) && $post['capcode']) {
 		$query->bindValue(':capcode', $post['capcode'], PDO::PARAM_INT);
 	} else {
diff --git a/inc/mod/pages.php b/inc/mod/pages.php
index 6d1e20b4..303fa3dd 100644
--- a/inc/mod/pages.php
+++ b/inc/mod/pages.php
@@ -1089,6 +1089,28 @@ function mod_sticky($board, $unsticky, $post) {
 	header('Location: ?/' . sprintf($config['board_path'], $board) . $config['file_index'], true, $config['redirect_http']);
 }
 
+function mod_cycle($board, $uncycle, $post) {
+	global $config;
+	
+	if (!openBoard($board))
+		error($config['error']['noboard']);
+	
+	if (!hasPermission($config['mod']['cycle'], $board))
+		error($config['error']['noaccess']);
+	
+	$query = prepare(sprintf('UPDATE ``posts_%s`` SET `cycle` = :cycle WHERE `id` = :id AND `thread` IS NULL', $board));
+	$query->bindValue(':id', $post);
+	$query->bindValue(':cycle', $uncycle ? 0 : 1);
+	$query->execute() or error(db_error($query));
+	if ($query->rowCount()) {
+		modLog(($uncycle ? 'Made not cyclical' : 'Made cyclical') . " thread #{$post}");
+		buildThread($post);
+		buildIndex();
+	}
+	
+	header('Location: ?/' . sprintf($config['board_path'], $board) . $config['file_index'], true, $config['redirect_http']);
+}
+
 function mod_bumplock($board, $unbumplock, $post) {
 	global $config;
 	
diff --git a/install.php b/install.php
index 5a6512ba..de4d3dd0 100644
--- a/install.php
+++ b/install.php
@@ -1,7 +1,7 @@
 <?php
 
 // Installation/upgrade file	
-define('VERSION', '5.1.1');
+define('VERSION', '5.1.2');
 
 require 'inc/functions.php';
 
@@ -570,6 +570,11 @@ if (file_exists($config['has_installed'])) {
 			  PRIMARY KEY (`id`),
 			  UNIQUE KEY `u_pages` (`name`,`board`)
 			) ENGINE=InnoDB DEFAULT CHARSET=utf8;') or error(db_error());
+		case '5.1.1':
+                        foreach ($boards as &$board) {
+                                query(sprintf("ALTER TABLE ``posts_%s`` ADD `cycle` int(1) NOT NULL AFTER `locked`", $board['uri'])) or error(db_error());
+                        }
+
 		case false:
 			// TODO: enhance Tinyboard -> vichan upgrade path.
 			query("CREATE TABLE IF NOT EXISTS ``search_queries`` (  `ip` varchar(39) NOT NULL,  `time` int(11) NOT NULL,  `query` text NOT NULL) ENGINE=MyISAM DEFAULT CHARSET=utf8;") or error(db_error());
diff --git a/mod.php b/mod.php
index fbe679ac..0378d55c 100644
--- a/mod.php
+++ b/mod.php
@@ -82,6 +82,7 @@ $pages = array(
 	'/(\%b)/deletebyip/(\d+)(/global)?'	=> 'secure deletebyip',		// delete all posts by IP address
 	'/(\%b)/(un)?lock/(\d+)'		=> 'secure lock',		// lock thread
 	'/(\%b)/(un)?sticky/(\d+)'		=> 'secure sticky',		// sticky thread
+	'/(\%b)/(un)?cycle/(\d+)'                         => 'secure cycle',          // cycle thread
 	'/(\%b)/bump(un)?lock/(\d+)'		=> 'secure bumplock',		// "bumplock" thread
 	
 	'/themes'				=> 'themes_list',		// manage themes
diff --git a/post.php b/post.php
index 0d3292bb..98aefe05 100644
--- a/post.php
+++ b/post.php
@@ -265,7 +265,7 @@ if (isset($_POST['delete'])) {
 	
 	//Check if thread exists
 	if (!$post['op']) {
-		$query = prepare(sprintf("SELECT `sticky`,`locked`,`sage`,`slug` FROM ``posts_%s`` WHERE `id` = :id AND `thread` IS NULL LIMIT 1", $board['uri']));
+		$query = prepare(sprintf("SELECT `sticky`,`locked`,`cycle`,`sage`,`slug` FROM ``posts_%s`` WHERE `id` = :id AND `thread` IS NULL LIMIT 1", $board['uri']));
 		$query->bindValue(':id', $post['thread'], PDO::PARAM_INT);
 		$query->execute() or error(db_error());
 		
@@ -867,6 +867,15 @@ if (isset($_POST['delete'])) {
 	$post['slug'] = slugify($post);
 	
 	insertFloodPost($post);
+
+	// Handle cyclical threads
+	if (!$post['op'] && isset($thread['cycle']) && $thread['cycle']) {
+		// Query is a bit weird due to "This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'" (MariaDB Ver 15.1 Distrib 10.0.17-MariaDB, for Linux (x86_64))
+		$query = prepare(sprintf('DELETE FROM ``posts_%s`` WHERE `thread` = :thread AND `id` NOT IN (SELECT `id` FROM (SELECT `id` FROM ``posts_%s`` WHERE `thread` = :thread ORDER BY `id` DESC LIMIT :limit) i)', $board['uri'], $board['uri']));
+		$query->bindValue(':thread', $post['thread']);
+		$query->bindValue(':limit', $config['cycle_limit'], PDO::PARAM_INT);
+		$query->execute() or error(db_error($query));
+	}
 	
 	if (isset($post['antispam_hash'])) {
 		incrementSpamHash($post['antispam_hash']);
diff --git a/templates/post/post_controls.html b/templates/post/post_controls.html
index 99a8484c..60dc6fc4 100644
--- a/templates/post/post_controls.html
+++ b/templates/post/post_controls.html
@@ -41,7 +41,6 @@
 {% endif %}
 
 {% endif %}
-
 {% if mod|hasPermission(config.mod.move, board.uri) %}
 	{% if not post.thread %}
 		<a title="{% trans %}Move thread to another board{% endtrans %}" href="?/{{ board.dir }}move/{{ post.id }}">{{ config.mod.link_move }}</a>&nbsp;
@@ -49,6 +48,13 @@
 		<a title="{% trans %}Move reply to another board{% endtrans %}" href="?/{{ board.dir }}move_reply/{{ post.id }}">{{ config.mod.link_move }}</a>&nbsp;
 	{% endif %}
 {% endif %}
+{% if mod|hasPermission(config.mod.cycle, board.uri) %}
+	{% if post.cycle %}
+	<a title="{% trans %}Make thread not cycle{% endtrans %}" href="?/{{ secure_link(board.dir ~ 'uncycle/' ~ post.id) }}">{{ config.mod.link_uncycle }}</a>&nbsp;
+	{% else %}
+	<a title="{% trans %}Make thread cycle{% endtrans %}" href="?/{{ secure_link(board.dir ~ 'cycle/' ~ post.id) }}">{{ config.mod.link_cycle }}</a>&nbsp;
+	{% endif %}
+{% endif %}
 {% if mod|hasPermission(config.mod.editpost, board.uri) %}
 	<a title="{% trans %}Edit post{% endtrans %}" href="?/{{ board.dir }}edit{% if config.mod.raw_html_default %}_raw{% endif %}/{{ post.id }}">{{ config.mod.link_editpost }}</a>&nbsp;
 {% endif %}
diff --git a/templates/post_thread.html b/templates/post_thread.html
index 72ca2998..125d5f78 100644
--- a/templates/post_thread.html
+++ b/templates/post_thread.html
@@ -19,25 +19,32 @@
 	<a class="post_no" onclick="citeReply({{ post.id }})" href="{% if isnoko50 %}{{ post.link('q', '50') }}{% else %}{{ post.link('q') }}{% endif %}">{{ post.id }}</a>
 	{% if post.sticky %}
 		{% if config.font_awesome %}
-			<i class="fa fa-thumb-tack"></i>
+			<i class="fa fa-thumb-tack" title="Sticky"></i>
 		{% else %}
 			<img class="icon" title="Sticky" src="{{ config.image_sticky }}" alt="Sticky" />
 		{% endif %}
 	{% endif %}
 	{% if post.locked %}
 		{% if config.font_awesome %}
-			<i class="fa fa-lock"></i>
+			<i class="fa fa-lock" title="Locked"></i>
 		{% else %}
 			<img class="icon" title="Locked" src="{{ config.image_locked }}" alt="Locked" />
 		{% endif %}
 	{% endif %}
 	{% if post.bumplocked and (config.mod.view_bumplock < 0 or (post.mod and post.mod|hasPermission(config.mod.view_bumplock, board.uri))) %}
 		{% if config.font_awesome %}
-			<i class="fa fa-anchor"></i>
+			<i class="fa fa-anchor" title="Bumplocked"></i>
 		{% else %}
 			<img class="icon" title="Bumplocked" src="{{ config.image_bumplocked }}" alt="Bumplocked" />
 		{% endif %}
 	{% endif %}
+	{% if post.cycle %}
+		{% if config.font_awesome %}
+			<i class="fa fa-refresh" title="Cyclical"></i>
+		{% else %}
+			<img class="icon" title="Cyclical" src="{{ config.image_sticky }}" alt="Cyclical" />
+		{% endif %}
+	{% endif %}
 	{% if index %}
 		<a href="{{ post.root }}{{ board.dir }}{{ config.dir.res }}{{ link_for(post) }}">[{% trans %}Reply{% endtrans %}]</a>
 	{% endif %}
diff --git a/templates/posts.sql b/templates/posts.sql
index 6b2249ef..070e687b 100644
--- a/templates/posts.sql
+++ b/templates/posts.sql
@@ -17,6 +17,7 @@ CREATE TABLE IF NOT EXISTS ``posts_{{ board }}`` (
    `ip` varchar(39) CHARACTER SET ascii NOT NULL,
    `sticky` int(1) NOT NULL,
    `locked` int(1) NOT NULL,
+   `cycle` int(1) NOT NULL,
    `sage` int(1) NOT NULL,
    `embed` text,
    `slug` varchar(256) DEFAULT NULL,