diff --git a/README.md b/README.md
index 201a113..0f97b9e 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ The tool requires two main arguments:
 Optional arguments:
 
 - `-concurrency`: The number of concurrent workers for reverse DNS lookup. Default is 10.
+- `-errors`: Allow showing errors for debugging purposes
 
 Example: