diff --git a/README.md b/README.md
index 4f96c6b..1fa049b 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,6 @@ Run the tests locally (against development environment):
 
 ## TODOs
 
-1. Implement flag post button
 1. Implement
    [bcrypt](https://metacpan.org/pod/Mojolicious::Plugin::BcryptSecure)
 1. Some sort of admin/moderator login and view
diff --git a/lib/PostText.pm b/lib/PostText.pm
index e846c9a..8b68045 100644
--- a/lib/PostText.pm
+++ b/lib/PostText.pm
@@ -81,6 +81,11 @@ sub startup($self) {
         ->to('thread#bump')
         ->name('bump_thread');
 
+    $thread->under('/flag')
+        ->get('/:thread_id', [thread_id => qr/[0-9]+/])
+        ->to('thread#flag')
+        ->name('flag_thread');
+
     # Remark
     my $remark = $r->under('/remark');
 
@@ -93,6 +98,11 @@ sub startup($self) {
         ->get('/:remark_id', [remark_id => qr/[0-9]+/])
         ->to('remark#by_id')
         ->name('single_remark');
+
+    $remark->under('/flag')
+        ->get('/:remark_id', [remark_id => qr/[0-9]+/])
+        ->to('remark#flag')
+        ->name('flag_remark');
 }
 
 1;
diff --git a/lib/PostText/Controller/Remark.pm b/lib/PostText/Controller/Remark.pm
index 6ef53ce..ab7c1fa 100644
--- a/lib/PostText/Controller/Remark.pm
+++ b/lib/PostText/Controller/Remark.pm
@@ -57,4 +57,18 @@ sub create($self) {
     return $self->render;
 }
 
+sub flag($self) {
+    my $remark_id    = $self->param('remark_id');
+    my $thread_id    = $self->remark->thread_id_for($remark_id);
+    my $redirect_url =
+        $self->url_for('single_thread', thread_id => $thread_id)
+            ->fragment('info')->to_abs;
+
+
+    $self->remark->flag($remark_id);
+    $self->flash(info => "Remark #$remark_id has been flagged. 🚩");
+
+    $self->redirect_to($redirect_url);
+}
+
 1;
diff --git a/lib/PostText/Controller/Thread.pm b/lib/PostText/Controller/Thread.pm
index f6cc724..0ba3a70 100644
--- a/lib/PostText/Controller/Thread.pm
+++ b/lib/PostText/Controller/Thread.pm
@@ -89,11 +89,21 @@ sub bump($self) {
     my $thread_id = $self->param('thread_id');
 
     $self->thread->bump($thread_id);
-    $self->flash(info => "Thread #$thread_id has been bumped.🔝");
+    $self->flash(info => "Thread #$thread_id has been bumped. 🔝");
 
     $self->redirect_to(
         $self->url_for('threads_list')->fragment('info')->to_abs
         );
 }
 
+sub flag($self) {
+    my $thread_id    = $self->param('thread_id');
+    my $redirect_url = $self->url_for('threads_list')->fragment('info')->to_abs;
+
+    $self->thread->flag($thread_id);
+    $self->flash(info => "Thread #$thread_id has been flagged. 🚩");
+
+    $self->redirect_to($redirect_url);
+}
+
 1;
diff --git a/lib/PostText/Model/Remark.pm b/lib/PostText/Model/Remark.pm
index d65c294..7f600bd 100644
--- a/lib/PostText/Model/Remark.pm
+++ b/lib/PostText/Model/Remark.pm
@@ -106,4 +106,20 @@ sub thread_id_for($self, $remark_id) {
        END_SQL
 }
 
+sub flag($self, $remark_id) {
+    $self->pg->db->query(<<~'END_SQL', $remark_id)
+        UPDATE remarks
+           SET flagged_status = TRUE
+         WHERE remark_id = ?;
+       END_SQL
+}
+
+sub unflag($self, $remark_id) {
+    $self->pg->db->query(<<~'END_SQL', $remark_id)
+        UPDATE remarks
+           SET flagged_status = FALSE
+         WHERE remark_id = ?;
+       END_SQL
+}
+
 1;
diff --git a/lib/PostText/Model/Thread.pm b/lib/PostText/Model/Thread.pm
index 30ee8a6..3679c6d 100644
--- a/lib/PostText/Model/Thread.pm
+++ b/lib/PostText/Model/Thread.pm
@@ -97,4 +97,20 @@ sub bump($self, $thread_id) {
        END_SQL
 }
 
+sub flag($self, $thread_id) {
+    $self->pg->db->query(<<~'END_SQL', $thread_id)
+        UPDATE threads
+           SET flagged_status = TRUE
+         WHERE thread_id = ?;
+       END_SQL
+}
+
+sub unflag($self, $thread_id) {
+    $self->pg->db->query(<<~'END_SQL', $thread_id)
+        UPDATE threads
+           SET flagged_status = FALSE
+         WHERE thread_id = ?;
+       END_SQL
+}
+
 1;
diff --git a/t/remark.t b/t/remark.t
index a3f0388..cf1df17 100644
--- a/t/remark.t
+++ b/t/remark.t
@@ -46,7 +46,11 @@ subtest 'Post new remark', sub {
 subtest 'Flagging remark', sub {
     $t->get_ok('/remark/single/1')->status_is(200)
         ->element_exists('a[href*="flag"]')
-        ->text_like(h2 => qr/Thread #1/);
-}
+        ->text_like(h2 => qr/Remark #1/);
+
+    $t->get_ok('/remark/flag/1')->status_is(200)
+        ->element_exists('p[class="field-with-info"]')
+        ->text_like(p => qr/Remark #1 has been flagged/);
+};
 
 done_testing();
diff --git a/t/thread.t b/t/thread.t
index 743d321..427737b 100644
--- a/t/thread.t
+++ b/t/thread.t
@@ -72,9 +72,13 @@ subtest 'Bumping thread', sub {
         ->element_exists('a[href*="bump"]')
         ->text_like(h2 => qr/Threads List/);
 
+    $t->get_ok('/thread/single/1')->status_is(200)
+        ->element_exists('a[href*="bump"]')
+        ->text_like(h2 => qr/Thread #1/);
+
     $t->get_ok('/thread/bump/1')->status_is(200)
         ->element_exists('p[class="field-with-info"]')
-        ->text_like(p => qr/Thread #[0-9]+ has been bumped/);
+        ->text_like(p => qr/Thread #1 has been bumped/);
 };
 
 subtest 'Flagging thread', sub {
@@ -85,6 +89,10 @@ subtest 'Flagging thread', sub {
     $t->get_ok('/thread/single/1')->status_is(200)
         ->element_exists('a[href*="flag"]')
         ->text_like(h2 => qr/Thread #1/);
-}
+
+    $t->get_ok('/thread/flag/1')->status_is(200)
+        ->element_exists('p[class="field-with-info"]')
+        ->text_like(p => qr/Thread #1 has been flagged/);
+};
 
 done_testing();
diff --git a/templates/remark/by_id.html.ep b/templates/remark/by_id.html.ep
index a737f1d..e405419 100644
--- a/templates/remark/by_id.html.ep
+++ b/templates/remark/by_id.html.ep
@@ -11,4 +11,5 @@
 </div>
 <nav>
   <%= link_to Thread => single_thread => {thread_id => $remark->{'thread_id'}} %>
+  <%= link_to Flag   => flag_remark   => {remark_id => $remark->{'id'}}        %>
 </nav>
diff --git a/templates/thread/by_id.html.ep b/templates/thread/by_id.html.ep
index 3286cb3..1b67be2 100644
--- a/templates/thread/by_id.html.ep
+++ b/templates/thread/by_id.html.ep
@@ -12,6 +12,7 @@
 <nav>
   <%= link_to Remark => post_remark => {thread_id => $thread->{'id'}} %>
   <%= link_to Bump   => bump_thread => {thread_id => $thread->{'id'}} %>
+  <%= link_to Flag   => flag_thread => {thread_id => $thread->{'id'}} %>
 </nav>
 <% if (my $first_remark = $remarks->[0]) { =%>
 <div class="remarks" id="remarks">
@@ -25,6 +26,9 @@
     <h4 class="date"><%= $remark->{'date'} %></h4>
     <h5 class="author"><%= $remark->{'author'} %></h5>
     <p class="body"><%= $remark->{'body'} %></p>
+    <nav>
+      <%= link_to Flag => flag_remark => {remark_id => $remark->{'id'}} %>
+    </nav>
   </article>
   <% } =%>
 </div>
diff --git a/templates/thread/by_page.html.ep b/templates/thread/by_page.html.ep
index b5e007d..744eea4 100644
--- a/templates/thread/by_page.html.ep
+++ b/templates/thread/by_page.html.ep
@@ -24,6 +24,9 @@
         Bump (<%= $thread->{'bump_count'} %> bumps)
       <% end %>
     </nav>
+    <nav>
+      <%= link_to Flag => flag_thread => {thread_id => $thread->{'id'}} %>
+    </nav>
   </article>
   <% } =%>
 </div>