diff --git a/docs/community/release.md b/docs/community/release.md
index 6d14174ee..d2d34bde7 100644
--- a/docs/community/release.md
+++ b/docs/community/release.md
@@ -85,6 +85,10 @@ export ASF_USERNAME=<your apache username>
 export ASF_PASSWORD=<your apache password>
 ```
 
+#### Java Home
+An available environment variable `JAVA_HOME`, you can do `echo $JAVA_HOME` to check it.
+Note that, the Java version should be 8.
+
 #### Subversion
 
 Besides on `git`, `svn` is also required for Apache release, please refer to
@@ -115,6 +119,11 @@ To export the PGP public key, using:
 gpg --armor --export 29BCC75D
 ```
 
+If you have more than one gpg key, you can specify the default key as following:
+```
+echo 'default-key <key-fpr>' > ~/.gnupg/gpg.conf
+```
+
 The last step is to update the KEYS file with your code signing key 
 https://www.apache.org/dev/openpgp.html#export-public-key