diff --git a/index.js.flow b/index.js.flow
index 54367a94e..942e35395 100644
--- a/index.js.flow
+++ b/index.js.flow
@@ -68,6 +68,8 @@ type AssertContext = {
 	};
 	// Assert that contents matches regex.
 	regex(contents: string, regex: RegExp, message?: string): void;
+	// Assert that contents matches a snapshot.
+	snapshot(contents: any, message?: string): void;
 	// Assert that contents does not match regex.
 	notRegex(contents: string, regex: RegExp, message?: string): void;
 	// Assert that error is falsy.