diff --git a/README.md b/README.md
index a97332d..1c8aae7 100644
--- a/README.md
+++ b/README.md
@@ -11,13 +11,14 @@ typescript-simple [![npm version][npm-image]][npm-url] [![downloads][npm-downloa
 
 * TypeScript v1.4 doesn't have simple TS string to JS string API
 * TypeScript v1.5 has [ts.transpile()](https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#a-simple-transform-function), but it cannot generate source map
-* TypeScript v1.6 has [ts.transpile()](https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#a-simple-transform-function) with source map, but it always ignores type checking
+* TypeScript v1.6+ has [ts.transpile()](https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#a-simple-transform-function) with source map, but it always ignores type checking
 
 ## Versioning
 
 * typescript-simple v1.x.x uses TypeScript v1.4
 * typescript-simple v2.x.x uses TypeScript v1.5
 * typescript-simple v3.x.x uses TypeScript v1.6
+* typescript-simple v4.x.x uses TypeScript v1.7
 
 Note: typescript-simple updates the major version for TypeScript's minor update including breaking changes.