diff --git a/llvm/docs/CodingStandards.rst b/llvm/docs/CodingStandards.rst
--- a/llvm/docs/CodingStandards.rst
+++ b/llvm/docs/CodingStandards.rst
@@ -1112,8 +1112,9 @@
   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``); lower case 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,