diff --git a/packages/babel-parser/typings/babel-parser.d.ts b/packages/babel-parser/typings/babel-parser.d.ts
index 775f76a485b0..414d7b15e40d 100644
--- a/packages/babel-parser/typings/babel-parser.d.ts
+++ b/packages/babel-parser/typings/babel-parser.d.ts
@@ -144,7 +144,7 @@ export interface DecoratorsPluginOptions {
 }
 
 export interface PipelineOperatorPluginOptions {
-    proposal: 'minimal' | 'smart';
+    proposal: 'minimal' | 'smart' | 'fsharp';
 }
 
 export interface RecordAndTuplePluginOptions {