<p dir="auto">This code will put the help text at the end of the  appended text. Should wrap under the input. input-prepend does work however.</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="&lt;div class=&quot;clearfix&quot;&gt;
    &lt;label for=&quot;pet-weight&quot;&gt;Initial Weight&lt;/label&gt;
    &lt;div class=&quot;input&quot;&gt;
        &lt;div class=&quot;input-append&quot;&gt;
            &lt;input class=&quot;span5&quot; id=&quot;pet-weight&quot; name=&quot;pet[weight]&quot; tabindex=&quot;6&quot; type=&quot;text&quot; value=&quot;&quot;&gt;
            &lt;span class=&quot;add-on&quot;&gt;lbs&lt;/span&gt;
        &lt;/div&gt;
        &lt;span class=&quot;help-block&quot;&gt;Some help text&lt;/span&gt;
    &lt;/div&gt;
&lt;/div&gt;"><pre class="notranslate"><code class="notranslate">&lt;div class="clearfix"&gt;
    &lt;label for="pet-weight"&gt;Initial Weight&lt;/label&gt;
    &lt;div class="input"&gt;
        &lt;div class="input-append"&gt;
            &lt;input class="span5" id="pet-weight" name="pet[weight]" tabindex="6" type="text" value=""&gt;
            &lt;span class="add-on"&gt;lbs&lt;/span&gt;
        &lt;/div&gt;
        &lt;span class="help-block"&gt;Some help text&lt;/span&gt;
    &lt;/div&gt;
&lt;/div&gt;
</code></pre></div>
<p dir="auto">When using <code class="notranslate">.help-block</code> with <code class="notranslate">.input-append</code>, the help text appears after the input instead of under it.</p>
<div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="&lt;div class=&quot;clearfix&quot;&gt;
  &lt;label for=&quot;appendedInput&quot;&gt;Appended text&lt;/label&gt;
  &lt;div class=&quot;input&quot;&gt;
    &lt;div class=&quot;input-append&quot;&gt;
      &lt;input type=&quot;text&quot; class=&quot;medium&quot; id=&quot;appendedInput&quot; name=&quot;appendedInput&quot; size=&quot;16&quot;&gt;
      &lt;span class=&quot;add-on&quot;&gt;%&lt;/span&gt;
    &lt;/div&gt;
    &lt;span class=&quot;help-block&quot;&gt;Here's some help text&lt;/span&gt;
  &lt;/div&gt;
&lt;/div&gt;"><pre class="notranslate"><span class="pl-kos">&lt;</span><span class="pl-ent">div</span> <span class="pl-c1">class</span>="<span class="pl-s">clearfix</span>"<span class="pl-kos">&gt;</span>
  <span class="pl-kos">&lt;</span><span class="pl-ent">label</span> <span class="pl-c1">for</span>="<span class="pl-s">appendedInput</span>"<span class="pl-kos">&gt;</span>Appended text<span class="pl-kos">&lt;/</span><span class="pl-ent">label</span><span class="pl-kos">&gt;</span>
  <span class="pl-kos">&lt;</span><span class="pl-ent">div</span> <span class="pl-c1">class</span>="<span class="pl-s">input</span>"<span class="pl-kos">&gt;</span>
    <span class="pl-kos">&lt;</span><span class="pl-ent">div</span> <span class="pl-c1">class</span>="<span class="pl-s">input-append</span>"<span class="pl-kos">&gt;</span>
      <span class="pl-kos">&lt;</span><span class="pl-ent">input</span> <span class="pl-c1">type</span>="<span class="pl-s">text</span>" <span class="pl-c1">class</span>="<span class="pl-s">medium</span>" <span class="pl-c1">id</span>="<span class="pl-s">appendedInput</span>" <span class="pl-c1">name</span>="<span class="pl-s">appendedInput</span>" <span class="pl-c1">size</span>="<span class="pl-s">16</span>"<span class="pl-kos">&gt;</span>
      <span class="pl-kos">&lt;</span><span class="pl-ent">span</span> <span class="pl-c1">class</span>="<span class="pl-s">add-on</span>"<span class="pl-kos">&gt;</span>%<span class="pl-kos">&lt;/</span><span class="pl-ent">span</span><span class="pl-kos">&gt;</span>
    <span class="pl-kos">&lt;/</span><span class="pl-ent">div</span><span class="pl-kos">&gt;</span>
    <span class="pl-kos">&lt;</span><span class="pl-ent">span</span> <span class="pl-c1">class</span>="<span class="pl-s">help-block</span>"<span class="pl-kos">&gt;</span>Here's some help text<span class="pl-kos">&lt;/</span><span class="pl-ent">span</span><span class="pl-kos">&gt;</span>
  <span class="pl-kos">&lt;/</span><span class="pl-ent">div</span><span class="pl-kos">&gt;</span>
<span class="pl-kos">&lt;/</span><span class="pl-ent">div</span><span class="pl-kos">&gt;</span></pre></div>
<p dir="auto"><em>P.S. I've only tested this with Bootstrap 1.0, please excuse me if it has already been fixed in 2.0.</em></p>