jixuan1989 commented on a change in pull request #2686:
URL: https://github.com/apache/iotdb/pull/2686#discussion_r576735501



##########
File path: docs/Development/ContributeGuide.md
##########
@@ -83,6 +83,21 @@ Precautions:
 * Do not use special Unicode chars, e.g., U+FF1A 
 * Do not use the character of dollar (as we will use Latex to generate pdf 
files)
 
+### Code Formatting
+
+We use the [Spotless
+plugin](https://github.com/diffplug/spotless/tree/main/plugin-maven) together 
with [google-java-format](https://github.com/google/google-java-format) to 
format our Java code. You can configure your IDE to automatically apply 
formatting on saving with these steps:
+
+1. Download the [google-java-format

Review comment:
       it can be installed in IDEA.. 
   Preferences -> plugins -> search google-java-format




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