diff --git a/README.md b/README.md
index 8aee3f6..94077c9 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ tracingReporterBufferSize=10000     # Optional Configuration. Default value is 1
 metricReporterFlushInterval=15000   # Optional Configuration. Default value is 15000 milliseconds
 metricReporterClientTimeout=10000   # Optional Configuration. Default value is 10000 milliseconds
 ```
-User can configure the environment variable `BALLERINA_NEWRELIC_API_KEY` instead of `apiKey` in `Config.toml`.
+User can configure the environment variable `BALLERINA_NEW_RELIC_API_KEY` instead of `apiKey` in `Config.toml`.
 If both are configured, `apiKey` in `Config.toml` will be overwritten by the environment variable value.
 
 ### Observe Metrics in New Relic