diff --git a/llvm/docs/CodingStandards.rst b/llvm/docs/CodingStandards.rst
--- a/llvm/docs/CodingStandards.rst
+++ b/llvm/docs/CodingStandards.rst
@@ -1112,8 +1112,10 @@
   nouns and start with an upper-case letter (e.g. ``TextFileReader``).
 
 * **Variable names** should be nouns (as they represent state).  The name should
-  be camel case, and start with an upper case letter (e.g. ``Leader`` or
-  ``Boats``).
+  be camel case.  In ``llvm/``, ``clang/``, ``clang-tools-extra/``, ``polly/``,
+  and ``bolt/``, the name should start with an upper-case letter (e.g.
+  ``Leader`` or ``Boats``); start with a lower case-letter letter for other
+  directories.
 
 * **Function names** should be verb phrases (as they represent actions), and
   command-like function should be imperative.  The name should be camel case,