clarify :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53218 91177308-0d34-0410-b5e6-96231b3b80d8

docs/CodingStandards.html

@@ -262,6 +262,18 @@ implements are defined.</p>
 like to print out code and look at your code in an xterm without resizing
 it.</p>
 
+<p>The longer answer is that there must be some limit to the width of the code
+in order to reasonably allow developers to have multiple files side-by-side in
+windows on a modest display.  If you are going to pick a width limit, it is
+somewhat arbitrary but you might as well pick something standard.  Going with
+90 columns (for example) instead of 80 columns wouldn't add any significant 
+value and would be detrimental to printing out code.  Also many other projects
+have standardized on 80 columns, so some people have already configured their
+editors for it (vs something else, like 90 columns).</p>
+
+<p>This is one of many contentious issues in coding standards, but is not up
+for debate.</p>
+
 </div>
 
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