Minor tweak on README

pkg/dev_compiler/README.md

Index: pkg/dev_compiler/README.md
diff --git a/pkg/dev_compiler/README.md b/pkg/dev_compiler/README.md
index fd6a0d741b3a139f29c1f505f5de2fe274ef38ca..4f6e803814b389c3b2b83463291772c8641d58e5 100644
--- a/pkg/dev_compiler/README.md
+++ b/pkg/dev_compiler/README.md
@@ -48,7 +48,7 @@ There are some import caveats where Dart concepts do not map directly:
 - *Libraries*.  Multiple Dart libraries are mapped to a single JS module.  Each library appears as a first class object in the generated JS module, with its top-level symbols as members.  We currently use a heuristic (based upon file paths) to ensure unique naming of generated library objects.
 - *Generics*.  Dart generics are *reified*, i.e., they are preserved at runtime.  Generic classes are mapped to factories that, given one or more type parameters, return an actual ES6 class (e.g., `HashMap$(core.String, core.int)` produces a class that represents a HashMap from strings to ints).  Similarly, generic methods are mapped to factories that, given one or more type parameters, return a method.  
 - *Dynamic*.  DDC supports dynamically typed code (i.e., Dart's `dynamic` type), but it will typically generate less readable and less efficient ES6 output as many type checks must be deferred to runtime.  All dynamic operations are invoked via runtime helper code.
-- *Constructors*.  Dart supports multiple, named constructors for a given class with a different initialization order for fields.  In general, these are mapped to static methods on the generated ES6 class.
+- *Constructors*.  Dart supports multiple, named and factory constructors for a given class with a different initialization order for fields.  Today, these are mapped to instance or static methods on the generated ES6 class.
 - *Private members*.  Dart maps private members (e.g., private fields or methods) to ES6 symbols.  For example, `a._x` may map to `a[_x]` where `_x` is a symbol only defined in the scope of the generated library.
 - *Scoping*.  Dart scoping rules and reserved words are slightly different than JavaScript.  While we try to preserve names wherever possible, in certain cases, we are required to rename.