diff --git a/llvm/docs/WritingAnLLVMPass.rst b/llvm/docs/WritingAnLLVMPass.rst
--- a/llvm/docs/WritingAnLLVMPass.rst
+++ b/llvm/docs/WritingAnLLVMPass.rst
@@ -1263,7 +1263,7 @@
 
 .. code-block:: c++
 
-  MachinePassRegistry RegisterMyPasses::Registry;
+  MachinePassRegistry<RegisterMyPasses::FunctionPassCtor> RegisterMyPasses::Registry;
 
 And finally, declare the command line option for your passes.  Example: