From 5f7124ec0157aa028e1d1f399b7ad9620ecd52de Mon Sep 17 00:00:00 2001
From: vany5921 <908744431@qq.com>
Date: Fri, 9 Oct 2020 18:33:55 +0800
Subject: [PATCH] Update sonic.md

---
 docs/en/unit/sonic.md | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/docs/en/unit/sonic.md b/docs/en/unit/sonic.md
index 6446459a..342c6324 100644
--- a/docs/en/unit/sonic.md
+++ b/docs/en/unit/sonic.md
@@ -8,18 +8,23 @@
 
 **Ultrasonic** is an ultrasonic distance measuring sensor unit, with the capability of simultaneous reception and transmission. The ultrasonic probe has a sound frequency of 40KHz, a direction angle of ±20 ° and an accuracy of 1mm. The internal part is calculated by an RCWL-9600 ultrasonic distance measuring chip, and the measurement results can be directly obtained through IIC interface (0x57). The effective distance is 20-1500mm.
 
-### Product Features
+## Product Features
 
 - Split transceiver
 - Effective distance 20-1500mm
 - Wide angle range
 - IIC communication, result output directly
 
-### Includes
+## Includes
 
 - 1x Ultrasonic Unit
 - 1x Grove Cable(20cm)
 
+## Application
+
+- Measuring distance
+- Avoid obstacles
+
 ## Specification
 
 <table>