diff --git a/index.html b/index.html
index d680311..bbc5646 100644
--- a/index.html
+++ b/index.html
@@ -442,8 +442,8 @@ <h5 class="modal-title" id="helpModalLabel">Help</h5>
           </div>
           <div class="modal-body">
             <div>
-              This is an emulator for the <a href="https://en.wikipedia.org/wiki/Bbc_micro">BBC Micro</a>
-              Model B, a popular home computer in the UK in the 1980s.
+              This is an emulator for the <a href="https://en.wikipedia.org/wiki/Bbc_micro">BBC Micro</a>, a popular
+              home computer in the UK in the 1980s. It emulates the BBC B &amp; Master version of the computer.
             </div>
             <div>
               The default disc image is Elite - a pioneering 3D space trading game. To boot discs on the BBC, one would
@@ -478,15 +478,33 @@ <h5>Handy key mappings</h5>
                   <td>
                     <div class="dbl key">*<br />:</div>
                   </td>
-                  <td>TODO</td>
-                  <td>TODO</td>
+                  <td>
+                    <div class="dbl key">"<br />'</div>
+                  </td>
+                  <td>
+                    <div class="dbl key">"<br />'</div>
+                  </td>
+                </tr>
+                <tr>
+                  <td>
+                    <div class="dbl key">CAPS<br />LOCK</div>
+                  </td>
+                  <td class="key">CAPSLOCK</td>
+                  <td>See notes</td>
                 </tr>
                 <tr>
                   <td>Debug</td>
                   <td><span class="key">Ctrl-Home</span></td>
-                  <td>TODO</td>
+                  <td><span class="key">Ctrl-Home</span></td>
                 </tr>
               </table>
+              <div>
+                Note that caps lock doesn't work well on OS X because browsers don't give proper key down and key up
+                events for that key. That means jsbeeb can't know when you've released the physical key; it just guesses
+                that you tapped the key whenever it notices the caps lock state changes. That's fine for typing but
+                means that some games that use caps lock for left or fire, don't work. Consult the main documentation
+                for details on how to map keys.
+              </div>
             </div>
           </div>
           <div class="modal-footer">
diff --git a/jsbeeb.css b/jsbeeb.css
index 2603c26..231c292 100644
--- a/jsbeeb.css
+++ b/jsbeeb.css
@@ -208,6 +208,11 @@ div.led {
   background-color: #911;
 }
 
+table.keymap {
+  margin-left: auto;
+  margin-right: auto;
+}
+
 table.keymap th {
   width: 5em;
 }
diff --git a/package.json b/package.json
index 37f0e65..a9efd3b 100644
--- a/package.json
+++ b/package.json
@@ -83,6 +83,6 @@
       "eslint --cache --fix",
       "prettier --write"
     ],
-    "*.{css,md}": "prettier --write"
+    "*.{css,md,html}": "prettier --write"
   }
 }