diff --git a/index.d.ts b/index.d.ts
index 52485c5..1d99892 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1 +1 @@
-export function exec(cmd: string, options: { name?: string, icns?: string }, callback: (error: string, stdout: string, stderr: string) => void): void;
\ No newline at end of file
+export function exec(cmd: string, options: { name?: string, icns?: string, env?: { [key: string]: string } }, callback: (error: string, stdout: string, stderr: string) => void): void;