diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -884,7 +884,9 @@
 
 ``llvm/lib/MC/``
 
-  (FIXME: T.B.D.)  ....?
+  Libraries that represent and process code at machine code level. 
+  Handles things like label names, machine instructions, and sections in the 
+  object file.
 
 ``llvm/lib/ExecutionEngine/``