diff --git a/include/mlir/IR/Types.h b/include/mlir/IR/Types.h
index cf346e0..0981255 100644
--- a/include/mlir/IR/Types.h
+++ b/include/mlir/IR/Types.h
@@ -113,8 +113,8 @@
   return os;
 }
 
-/// Primitive types are the atomic base of the type system, including integer
-/// and floating point values.
+/// Primitive types are the atomic base of the type system, including affine
+/// integer and floating point values.
 class PrimitiveType : public Type {
 public:
   static PrimitiveType *get(Kind kind, MLIRContext *context);