diff --git a/package.json b/package.json
index ec87111..2a11fb1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "bufferstuff",
-	"version": "1.4.1",
+	"version": "1.4.2",
 	"description": "A set of utility classes for reading and writing binary data in NodeJS and the browser",
 	"main": "./lib/index.js",
 	"types": "./lib/index.d.ts",
diff --git a/readers/IReader.ts b/readers/IReader.ts
index aff852d..eec30ac 100644
--- a/readers/IReader.ts
+++ b/readers/IReader.ts
@@ -2,6 +2,8 @@
 // Check LICENSE in repository root for more information.
 
 export interface IReader {
+	readOffset: number,
+	length: number,
 	readBuffer(bytes:number): Buffer,
 	readUint8Array(bytes:number): Uint8Array,
 	readByte(): number,
diff --git a/writers/IWriter.ts b/writers/IWriter.ts
index 173390a..1bd2250 100644
--- a/writers/IWriter.ts
+++ b/writers/IWriter.ts
@@ -2,6 +2,8 @@
 // Check LICENSE in repository root for more information.
 
 export interface IWriter {
+	writeOffset: number,
+	length: number,
 	toBuffer(): Buffer,
 	toString(): string,
 	writeBuffer(buffer:Buffer): IWriter,