diff --git a/llvm/docs/CodingStandards.rst b/llvm/docs/CodingStandards.rst
--- a/llvm/docs/CodingStandards.rst
+++ b/llvm/docs/CodingStandards.rst
@@ -1263,6 +1263,18 @@
   bool NewToSet = Myset.insert(Value); (void)NewToSet;
   assert(NewToSet && "The value shouldn't be in the set yet");
 
+Prefer C++-style casts
+^^^^^^^^^^^^^^^^^^^^^^
+
+When casting, use ``static_cast`` and ``reinterpret_cast`` rather than C-style
+casts. The sole exception to this is when casting to void to suppress warnings
+about unused variables, when C-style casts should be preferred instead:
+
+.. code-block:: c++
+  int x = 42;
+  long *y = static_cast<long *>(&x);
+  (void)y;
+
 Do Not Use ``using namespace std``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^