diff --git a/docs/wiki/preparation/Environment-variables.md b/docs/wiki/preparation/Environment-variables.md
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--- a/docs/wiki/preparation/Environment-variables.md
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@@ -1,2 +1,9 @@
 # Supported environment variables
 
+| Variable | Description | Default value |
+| -------------- | ----------- | --------------- |
+| SQLALCHEMY_DATABASE_URI | SQL Alchemy URI to connect to database | <no default> |
+| SECRET_KEY   | Flask secret key [^1] | <no default> |
+
+
+[^1]: Flask secret key (see https://flask.palletsprojects.com/en/2.0.x/config/#SECRET_KEY for how to generate)