diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index 4af525f2..05af14a2 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -435,10 +435,17 @@ export class InputHandler extends Disposable implements IInputHandler {
     this._terminal.updateRange(buffer.y);
   }
 
-  addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): IDisposable {
+  /**
+   * Forward addCsiHandler from parser.
+   */
+  public addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): IDisposable {
     return this._parser.addCsiHandler(flag, callback);
   }
-  addOscHandler(ident: number, callback: (data: string) => boolean): IDisposable {
+
+  /**
+   * Forward addOscHandler from parser.
+   */
+  public addOscHandler(ident: number, callback: (data: string) => boolean): IDisposable {
     return this._parser.addOscHandler(ident, callback);
   }
 
diff --git a/src/Types.ts b/src/Types.ts
index 1611fb55..67ad32d9 100644
--- a/src/Types.ts
+++ b/src/Types.ts
@@ -112,6 +112,8 @@ export interface ICompositionHelper {
 export interface IInputHandler {
   parse(data: string): void;
   print(data: Uint32Array, start: number, end: number): void;
+  addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): IDisposable;
+  addOscHandler(ident: number, callback: (data: string) => boolean): IDisposable;
 
   /** C0 BEL */ bell(): boolean;
   /** C0 LF */ lineFeed(): boolean;