diff --git a/PublicProperty.js b/PublicProperty.js
index 5d094a9..5714fd2 100644
--- a/PublicProperty.js
+++ b/PublicProperty.js
@@ -1,11 +1,13 @@
 // no dependencies
 
-export const __DEBUG__ = 1;
-export const __APP_VERSION__ = 'v0.3.0a';
+export const __DEBUG__ = 0;
+export const __APP_VERSION__ = 'v0.3.1-beta';
 
 export const __APP_INTRO__ = `
 <b>Algorithm improvement.</b><br>
 Our new routing solution is based on the Obvious A-Star algorithm now, with 2~10x faster speed in calculations.<br>
 <b>Support concatenating paths.</b><br>
 You can add points sequentially on the map.<br>
+<b>Clear the map.</b><br>
+Clear all markers with one click.<br>
 `;
\ No newline at end of file