update

dillonHe · Jan 23, 2018 · f0e9d0c · f0e9d0c
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diff --git a/Tutorial/PCB.md b/Tutorial/PCB.md
@@ -609,6 +609,11 @@ It will open a webpage to you, and you can download the gerber as a zipfile.
 
 **Notice:** 
 *Before order your PCB, Please read [Essential Check Before Placing a PCB Order](./PCBOrder.htm/#Essential-Check-Before-Placing-a-PCB-Order) section!!*
+Before generating the Gerber files or save to cart:
+   1.Please check the packages size and polarity carefully;
+   2.Please check the DRC error in Design Manager;
+   3.Please rebuild the copper area after modifying tracks and packages.
+   4.Please click the Gerber View button to preview the gerber whether conforms to the design requirements.
 
 
 
diff --git a/Tutorial/WhatsNew.md b/Tutorial/WhatsNew.md
@@ -23,6 +23,21 @@ Any questions, please contact our technical support via support@easyeda.co
 
 # Updated Instructions
 
+**What is new in v5.1.3**
+
+2018.01.22:
+
+-	Improvement:
+
+	-	Solved the auto router will remove the existing tracks when disable the "Remove the Existing Tracks" option issue, we change this option to "Skip the Routed Nets".
+	-	Fixed the script can't be saved issue.
+	-	Fixed Chrome 62 and greater version the SVG preview doesn't work issue.
+	-	Fixed the global delete can't delete the arc track issue.
+
+-	Forecast：
+    -	What's new of the next major release? please refer to: [https://easyeda.com/forum/topic/ForecastWhats_new_of_the_major_version_v5_3_X-BGO60icuM](https://easyeda.com/forum/topic/ForecastWhats_new_of_the_major_version_v5_3_X-BGO60icuM)
+
+
 **What is new in v4.11.9**
 
 2017.11.22: