diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 2eb732ac..32c8b0a0 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -487,7 +487,12 @@ declare module 'xterm' {
      * @param key The option key.
      */
     getOption(key: 'handler'): (data: string) => void;
- 
+    /**
+     * Retrieves an option's value from the terminal.
+     * @param key The option key.
+     */
+    getOption(key: string): any;
+
     /**
      * Sets an option on the terminal.
      * @param key The option key.
@@ -543,10 +548,18 @@ declare module 'xterm' {
      */
     setOption(key: 'theme', value: ITheme): void;
     /**
-     * Retrieves an option's value from the terminal.
+     * Sets an option on the terminal.
      * @param key The option key.
+     * @param value The option value.
      */
     setOption(key: 'cols' | 'rows', value: number): void;
+    /**
+     * Sets an option on the terminal.
+     * @param key The option key.
+     * @param value The option value.
+     */
+    setOption(key: string, value: any): void;
+
     /**
      * Tells the renderer to refresh terminal content between two rows
      * (inclusive) at the next opportunity.