diff --git a/table-of-contents.html b/table-of-contents.html
old mode 100644
new mode 100755
index 090a266..49548e4
--- a/table-of-contents.html
+++ b/table-of-contents.html
@@ -44,6 +44,7 @@ ul li ol{margin:0;padding:0 0 0 2.5em}
   <li><a href=your-first-python-program.html#whatsanobject>What&#8217;s an object?</a>
   </ol>
   <li><a href=your-first-python-program.html#indentingcode>Indenting code</a>
+  <li><a href=your-first-python-program.html#exceptions>Exceptions</a>
   <li><a href=your-first-python-program.html#runningscripts>Running scripts</a>
   <li><a href=your-first-python-program.html#furtherreading>Further reading</a>
   </ol>
diff --git a/util/lesscss.py b/util/lesscss.py
old mode 100644
new mode 100755
index 70a2a00..a732360
--- a/util/lesscss.py
+++ b/util/lesscss.py
@@ -7,7 +7,7 @@ import sys
 # These selectors are kept regardless of whether this script thinks they are used.
 # Most of these match nodes that are dynamically inserted or manipulated by script
 # after the page has loaded, which is why a static analysis thinks they're unused.
-SELECTOR_EXCEPTIONS = ('.w', '.b', '.str', '.kwd', '.com', '.typ', '.lit', '.pun', '.tag', '.atn', '.atv', '.dec', 'pre .u', 'pre .u span')
+SELECTOR_EXCEPTIONS = ('.w', '.b', '.str', '.kwd', '.com', '.typ', '.lit', '.pun', '.tag', '.atn', '.atv', '.dec', 'pre .u', 'pre .u span', 'li ol')
 
 filename = sys.argv[1]
 pqd = pq(filename=filename)