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diff --git a/how_to_get_the_programming_languages_running_on_your_computer.mdwn b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
index f9fa2d43..46486c02 100644
--- a/how_to_get_the_programming_languages_running_on_your_computer.mdwn
+++ b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
@@ -75,11 +75,22 @@ systems.
 
 **For all of these groups**, a general item to take note of is what "processor architecture" your machine is running. Three of the possibilities are:
 
-*       One of Intel's i386, i486, i586, i686 architectures. These are collectively known as "x86" or "IA-32" or sometimes just "32-bit".
-*       Intel or AMD's x86\_64 architecture. This is sometimes also called "x64" or "amd64" or "IA-64" or sometimes just "64-bit".
-*       ARM or some other architecture. These are generally lower-powered machines, like iPads. Some of the software we're proposing *might* in principle be capable of running on such machines, but installers don't seem to be available. We'll assume you have access to an x86 or x86\_64 machine.
-
-In the Linux example above, I could tell my machine is running x86 because the result of the `uname` command said "i386" at the end. Another machine I have says "x86\_64" at the end. On a Mac, you can also say `uname -m` in a Terminal session, and it will say something like "i386". I think that Mac OS's from Lion / 10.7 forward have all been x86\_64-only. On Windows, I don't know how to collect this information. But generally, machines running Windows XP will probably be i386/32-bit (unless it's a version of Windows with "64-bit" or "x64" in its title); machines running Windows Vista or Windows 7 or Windows 8 could be running either x86/32-bit or x64/64-bit.
+*   One of Intel's i386, i486, i586, i686 architectures. These are collectively known as "x86" or "IA-32" or sometimes just "32-bit".
+*   Intel or AMD's x86\_64 architecture. This is sometimes also called "x64" or "amd64" or "IA-64" or sometimes just "64-bit".
+*   ARM or some other architecture. These are generally lower-powered machines, like iPads. Some of the software we're proposing *might* in principle be capable of running on such machines, but installers don't seem to be available. We'll assume you have access to an x86 or x86\_64 machine.
+
+In the Linux example above, I could tell my machine is running x86 because the
+result of the `uname` command said "i386" at the end. Another machine I have
+says "x86\_64" at the end. On a Mac, you can also say `uname -m` in a Terminal
+session, and it will say something like "i386". I think that Mac OS's from Lion
+/ 10.7 forward have all been x86\_64-only. On Windows, I don't know how to
+collect this information. But generally, machines running Windows XP will
+probably be i386/32-bit (unless it's a version of Windows with "64-bit" or
+"x64" in its title); machines running Windows Vista or Windows 7 or Windows 8
+could be running either x86/32-bit or x64/64-bit.
+(Update: I found
+[this Microsoft page](http://windows.microsoft.com/en-us/windows/32-bit-and-64-bit-windows)
+that may help.)
 
 
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