--- a/toolkit/content/license.html
+++ b/toolkit/content/license.html
@@ -78,16 +78,17 @@
       <li><a href="about:license#babylon">Babylon License</a></li>
       <li><a href="about:license#base64">base64 License</a></li>
       <li><a href="about:license#bincode">bincode License</a></li>
       <li><a href="about:license#bindgen">bindgen License</a></li>
       <li><a href="about:license#bspatch">bspatch License</a></li>
       <li><a href="about:license#byteorder">byteorder License</a></li>
       <li><a href="about:license#cairo">Cairo Component Licenses</a></li>
       <li><a href="about:license#chromium">Chromium License</a></li>
+      <li><a href="about:license#clap">clap License</a></li>
       <li><a href="about:license#codemirror">CodeMirror License</a></li>
       <li><a href="about:license#cubic-bezier">cubic-bezier License</a></li>
       <li><a href="about:license#d3">D3 License</a></li>
       <li><a href="about:license#dagre-d3">Dagre-D3 License</a></li>
       <li><a href="about:license#diff">diff License</a></li>
       <li><a href="about:license#dtoa">dtoa License</a></li>
       <li><a href="about:license#fuzz-aldrin">fuzz-aldrin License</a></li>
       <li><a href="about:license#hunspell-nl">Dutch Spellchecking Dictionary License</a></li>
@@ -3066,16 +3067,48 @@ DATA, OR PROFITS; OR BUSINESS INTERRUPTI
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 </pre>
 
 
     <hr>
 
+    <h1><a id="clap"></a>clap License</h1>
+
+    <p>This license applies to files in the directory
+    <code>third_party/rust/clap</code>.</p>
+
+<pre>
+The MIT License (MIT)
+
+Copyright (c) 2015-2016 Kevin B. Knapp
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+</pre>
+
+
+    <hr>
+
     <h1><a id="codemirror"></a>CodeMirror License</h1>
 
     <p>This license applies to all files in
       <code>devtools/client/sourceeditor/codemirror</code> and
       to specified files in the <code>devtools/client/sourceeditor/test/</code>:
     </p>
     <ul>
       <li><code>cm_comment_test.js</code></li>