diff --git a/README.md b/README.md
index 66bcf0a..a3e2df8 100644
--- a/README.md
+++ b/README.md
@@ -10,3 +10,5 @@ General pattern to run the code is using **stdin** to pass the data file:
 ```sh
 go run ./day1 < ./day1/input.txt
 ```
+
+Majority of solutions support `-debug` flag.