diff --git a/types/rc/index.d.ts b/types/rc/index.d.ts
index 9a2c6783f6..3ab9cc3a26 100644
--- a/types/rc/index.d.ts
+++ b/types/rc/index.d.ts
@@ -6,8 +6,17 @@
 declare function rc(
 	name: string,
 	defaults?: any,
+    /**
+     * Parsed argv object. For example, if args is `--foo bar`, then this value should be `{foo: 'bar'}`
+     * If `argv` is `null` or `undefined`, then `rc`'s default parser will parse `process.argv`.
+     */
 	argv?: {} | null,
+    /**
+     * Custom config file parser.
+     * This function will be passed the string contents of each
+     * discovered configuration file should return a parsed object dictionary.
+     */
 	parse?: ((content: string) => any) | null
 ): any;
 
-export = rc;
\ No newline at end of file
+export = rc;