diff --git a/README.md b/README.md
index 28c6b375..5f009a48 100644
--- a/README.md
+++ b/README.md
@@ -175,6 +175,7 @@ Environment variables can be used within your container :
 * `TZ` : Timezone assigned
 * `LOG_LEVEL` : Log level output (default `info`)
 * `LOG_JSON`: Enable JSON logging output (default `false`)
+* `LOG_CALLER`: Enable to add file:line of the caller (default `false`)
 * `RUN_STARTUP`: Run on startup (default `false`)
 
 Docker compose is the recommended way to run this image. Copy the content of folder [.res/compose](.res/compose) in `/opt/diun/` on your host for example. Edit the compose and config file with your preferences and run the following commands :