Index: llvm/docs/GettingStarted.rst
===================================================================
--- llvm/docs/GettingStarted.rst
+++ llvm/docs/GettingStarted.rst
@@ -884,7 +884,8 @@
 
 ``llvm/lib/MC/``
 
-  (FIXME: T.B.D.)  ....?
+  Libraries that represent and processs code at machine code level. It produces machine code object file.
+  Handles things like label names, machine instructions, and sections in the object file.
 
 ``llvm/lib/ExecutionEngine/``