Installation.md

@@ -52,6 +52,7 @@ Now create a `.env` file in the root directory of ChiefExam and define the follo
 DATABASE_URL=...
 REDIS_URL=...  (optional)
 JAVA_HOME=...  (optional)
+JAVA_CONFIG_FOLDER=... (optional)
 PYTHON_HOME... (optional)
 SECRET_KEY...
 [...]
@@ -61,6 +62,7 @@ An example `.env` file:
 ```
 DATABASE_URL=postgresql+psycopg2://<user>:<password>@<host>/<database>
 JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64/
+JAVA_CONFIG_FOLDER=/etc/java-11-openjdk/
 PYTHON_HOME=/home/<user>/chiefexam/env/
 SECRET_KEY=<some strong key>
 DEBUG=True