diff --git a/src/interfaces/index.ts b/src/interfaces/index.ts
index 94674981..4b49296e 100644
--- a/src/interfaces/index.ts
+++ b/src/interfaces/index.ts
@@ -9,6 +9,7 @@ export type {Logger} from './logger'
 export type {Manifest} from './manifest'
 export type {
   Arg,
+  ArgDefinition,
   ArgInput,
   BooleanFlag,
   CustomOptions,