From 7c59510b6061b92e81a314c101ed8043a2a37c4a Mon Sep 17 00:00:00 2001
From: fzyzcjy <117010016@link.cuhk.edu.cn>
Date: Fri, 19 Mar 2021 08:20:13 +0800
Subject: [PATCH] add null safety guide to readme (#299)

---
 packages/pigeon/README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/pigeon/README.md b/packages/pigeon/README.md
index 30fa261dfe..699cffdb96 100644
--- a/packages/pigeon/README.md
+++ b/packages/pigeon/README.md
@@ -110,6 +110,12 @@ public interface Api2Host {
 }
 ```
 
+## Null Safety (NNBD)
+
+In order to generate null-safe code run the command line with the extra argument
+`--dart_null_safety`. For example:
+`flutter pub run pigeon --input ./pigeons/messages.dart --dart_null_safety`.
+
 ## Feedback
 
 File an issue in [flutter/flutter](https://github.com/flutter/flutter) with the