diff --git a/exporter/prometheusremotewriteexporter/README.md b/exporter/prometheusremotewriteexporter/README.md
index e7c1dea82d0..617e5e738f9 100644
--- a/exporter/prometheusremotewriteexporter/README.md
+++ b/exporter/prometheusremotewriteexporter/README.md
@@ -44,7 +44,9 @@ exporters:
   prometheusremotewrite:
     endpoint: "http://some.url:9411/api/prom/push"
     wal:
-        dir: "DIRECTORY_HERE"
+        path: "DIRECTORY_HERE"
+        truncate-frequency: "Optional Frequency in seconds per time.ParseDuration https://golang.org/pkg/time/#ParseDuration, default of 1m"
+        cache-size: "An optional size before truncating the WAL, default of 300"
 ```
 
 ## Advanced Configuration