Update C++ style guide to 3.245:
 - Relax the rule for sizeof(varname) vs. sizeof(type).
 - Allow an exception for nonconst reference parameters where
   convention dictates their use, such as for swap.
 - C++11: allow static_assert.
 - Require non-trivial fall-through between cases in switch
   statements to be annotated. Trivial fall-through includes
   consecutive case labels with no intervening code, and no comment
   is required in these cases.
 - C++11: allow constexpr.
 - Revise the "Integer Types" section to note type-width problems.
 - Clarify that the "arguments on subsequent lines" function call
   style is acceptable even when the 80-column limit doesn't require
   it.
 - Boost: allow part of Polygon.
 - C++11: allow <tuple>.

Update Objective-C style guide to 2.52:
 - Fix ARC example to not imply the use of @private in .m files.
 - Add an example to the "Category Names" section.
 - Require that ARC-using files insert preprocessor directives that
   generate an error when compiling without ARC.
 - Fix spacing around the *s in the ARC example per the C++ style
   guide.

Update Python style guide to 2.48:
 - Allow comments with URLs to exceed 80 characters per line.
 - Update outdated implicit-line-joining URLs.

Update HTML/CSS style guide to 2.21:
 - Consistent use of title case.
 - Add new "Declaration Block Separation" section.
 - Add a CSS example to the "Capitalization" section.
 - Minor fixes to whitespace.

Update JavaScript style to guide to 2.72:
 - Make it clear that the injunction against aliasing namespaces only
   applies to local aliases, not goog.scope.
 - Clarify the style guide's recommendation on array/object literals.
 - Add documentation on @private {type}, @protected {type}, and
   @const {type}.
 - Make JSDoc descriptions required only if not obvious.
 - Clarify that only private properties and methods need a trailing
   underscore.
 - Fix spelling of arv's name.

Update Common Lisp style guide to 1.18:
 - Macro-defining macros are harder to understand for everyone, not
   just for the "uninitiated." There's no need to condescend.

In all of the above style guides:
 - The guide source is now encoded as UTF-8. The numeric character
   references have been replaced with raw UTF-8-encoded characters.
diff --git a/pyguide.html b/pyguide.html
index 3c6a3e0..7213d7a 100644
--- a/pyguide.html
+++ b/pyguide.html
@@ -136,7 +136,7 @@
 <H1>Google Python Style Guide</H1>
   <p align="right">
 
-    Revision 2.45
+    Revision 2.48
   </p>
   
   <address>
@@ -1246,9 +1246,11 @@
       </DIV>
       <DIV class=""><DIV class="stylepoint_body" name="Line_length__body" id="Line_length__body" style="display: none">
     <p>
-      Exception: lines importing modules may end up longer than 80
-      characters only if using Python 2.4 or
-      earlier.
+      Exceptions:
+      <ul>
+        <li>Long import statements.</li>
+        <li>URLs in comments.</li>
+      </ul>
     </p>
 
     <p>
@@ -1258,7 +1260,7 @@
     <p>
       Make use of Python's
       
-      <a HREF="http://www.python.org/doc/ref/implicit-joining.html">implicit
+      <a HREF="http://docs.python.org/reference/lexical_analysis.html#implicit-line-joining">implicit
       line joining inside parentheses, brackets and braces</a>.
       If necessary, you can add an extra pair of parentheses around an
       expression.
@@ -1282,6 +1284,17 @@
 <span class="external"></span>     'long long long long long long string')</PRE></DIV>
 
     <p>
+      Within comments, put long URLs on their own line if necessary.
+    </p>
+
+    <DIV class=""><PRE>Yes:  <span class="external"></span># See details at
+      <span class="external"></span># http://www.example.com/us/developer/documentation/api/content/v2.0/csv_file_name_extension_full_specification.html</PRE></DIV>
+
+    <DIV class=""><PRE class="badcode">No:  <span class="external"></span># See details at
+     <span class="external"></span># http://www.example.com/us/developer/documentation/api/content/\
+     <span class="external"></span># v2.0/csv_file_name_extension_full_specification.html</PRE></DIV>
+
+    <p>
       Make note of the indentation of the elements in the line
       continuation examples above; see the
       <a HREF="#Indentation">indentation</a>
@@ -2223,7 +2236,7 @@
 
 
 <p align="right">
-Revision 2.45
+Revision 2.48
 </p>