[docs] Document what "NFC" means in a commit message.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217292 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/Lexicon.rst b/docs/Lexicon.rst
index 65b7a3e84cdaa9accab270701eee5466903e35ce..9a599da1285916c64e5fa2c27b23341f6d0cf6cc 100644 (file)
--- a/docs/Lexicon.rst
+++ b/docs/Lexicon.rst
@@ -133,6 +133,15 @@ M
 **MC**
     Machine Code
 
+N
+-
+
+**NFC**
+  "No functional change". Used in a commit message to indicate that a patch
+  is a pure refactoring/cleanup.
+  Usually used in the first line, so it is visible without opening the
+  actual commit email.
+
 O
 -
 .. _object pointer: