diff --git a/docs/HowToUseInstrMappings.rst b/docs/HowToUseInstrMappings.rst
index b51e74e..bf9278e 100644
--- a/docs/HowToUseInstrMappings.rst
+++ b/docs/HowToUseInstrMappings.rst
@@ -120,7 +120,7 @@
 following to be the current definitions of ADD, ADD_pt (true) and ADD_pf (false)
 instructions:
 
-.. code-block::llvm
+.. code-block:: llvm
 
   def ADD : ALU32_rr<(outs IntRegs:$dst), (ins IntRegs:$a, IntRegs:$b),
               "$dst = add($a, $b)",
@@ -141,7 +141,7 @@
 required by the relationship model, <tt>getPredOpcode</tt>, so that they can
 be related.
 
-.. code-block::llvm
+.. code-block:: llvm
 
   def ADD : PredRel, ALU32_rr<(outs IntRegs:$dst), (ins IntRegs:$a, IntRegs:$b),
               "$dst = add($a, $b)",