diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -9132,7 +9132,17 @@
 .. code-block:: text
 
       <result> = fadd float 4.0, %var          ; yields float:result = 4.0 + %var
+      .
+.. _i_neg:
+'``neg``' Instruction
+^^^^^^^^^^^^^^^^^^^^^
 
+Overview:
+"""""""""
+
+The '``sub``' instruction is used to represent the '``neg``'
+instruction.
+      
 .. _i_sub:
 
 '``sub``' Instruction