diff --git a/PostText.pl b/PostText.pl
index ea2c361..524e857 100755
--- a/PostText.pl
+++ b/PostText.pl
@@ -28,8 +28,6 @@ helper thread => sub {
 under sub ($c) {
     $c->session(expires => time() + 31536000);
 
-    $c->stash(status => 400) if $c->flash('invalid_input');
-
     1;
 };
 
@@ -73,17 +71,17 @@ any [qw{GET POST}], '/post', sub ($c) {
         $v->required('post' )->size(2, 4000);
 
         if ($v->has_error) {
-            $c->flash(invalid_input => 'Invalid thread title/text.')
+            $c->stash(status => 400)
         }
         else {
             $c->thread->create_thread(
                 $thread_author,
                 $thread_title,
                 $thread_body
-                )
-        }
+                );
 
-        return $c->redirect_to('view');
+            return $c->redirect_to('view');
+        }
     }
 
     return $c->render();
diff --git a/README.md b/README.md
index aba5800..f386ebf 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,6 @@ Run the tests locally (against development environment)
 
 ## TODOs
 
-1. Display error for invalid input (call `flash()` in template)
+1. Setup [Mojolicious::Plugin::AssetPack](https://metacpan.org/pod/Mojolicious::Plugin::AssetPack)
 1. Pick a date format
 1. Reply model
diff --git a/t/post.t b/t/post.t
index 8ab4305..ce3bae5 100644
--- a/t/post.t
+++ b/t/post.t
@@ -6,19 +6,25 @@ use Test::More;
 use Mojo::File qw{curfile};
 use Test::Mojo;
 
-my $script         = curfile->dirname->sibling('PostText.pl');
-my $t              = Test::Mojo->new($script);
-my %valid_params   = (
+my $script        = curfile->dirname->sibling('PostText.pl');
+my $t             = Test::Mojo->new($script);
+my %valid_params  = (
     name  => 'Anonymous',
     title => 'hi',
     post  => 'ayy... lmao'
     );
-my %invalid_params = (
+my %invalid_title = (
     name => 'Anonymous',
     title => '',
+    post => 'ayy... lmao'
+    );
+my %invalid_post  = (
+    name => 'Anonymous',
+    title => 'hi',
     post => 'a'
     );
 
+
 $t->ua->max_redirects(1);
 
 # GET
@@ -27,8 +33,11 @@ $t->get_ok('/post')->status_is(200)->text_like(h2 => qr/New Thread/);
 # POST
 $t->post_ok('/post')->status_is(200)->text_like(h2 => qr/New Thread/);
 
-$t->post_ok('/post', form => \%invalid_params)->status_is(400)
-    ->text_like(h2 => qr/View Threads/);
+$t->post_ok('/post', form => \%invalid_title)->status_is(400)
+    ->text_like(p => qr/Invalid title/);
+
+$t->post_ok('/post', form => \%invalid_post)->status_is(400)
+    ->text_like(p => qr/Invalid post/);
 
 $t->post_ok('/post', form => \%valid_params)->status_is(200)
     ->text_like(h2 => qr/View Threads/);
diff --git a/templates/post.html.ep b/templates/post.html.ep
index 2c2f75a..aef4b41 100644
--- a/templates/post.html.ep
+++ b/templates/post.html.ep
@@ -5,18 +5,28 @@
   <div class="name field">
     <%= label_for name => 'Author' %>
     <%= text_field name =>'Anonymous', maxlength => 63, minlength => 1 %>
+    <% if (my $error = validation->error('name')) { =%>
+      <p class="field-with-error">Invalid name: 1 to 63 characters please.</p>
+    <% } =%>
   </div>
   <div class="title field">
     <%= label_for title => 'Title' %>
     <%= text_field 'title', maxlength => 127, minlength => 1 %>
+    <% if (my $error = validation->error('title')) { =%>
+      <p class="field-with-error">Invalid title: 1 to 127 characters please.</p>
+    <% } =%>
   </div>
   <div class="text field">
     <%= label_for post => 'Text' %>
-    <%= text_area 'post',
+    <%= text_area 'post', (
         maxlength => 4000,
         minlength => 2,
         required  => 'true',
-        rows      => 6 %>
+        rows      => 6
+    ) %>
+    <% if (my $error = validation->error('post')) { =%>
+      <p class="field-with-error">Invalid post: Up to 4,000 characters only.</p>
+    <% } =%>
   </div>
   <%= submit_button 'Post', class => 'post button' %>
 </form>