diff --git a/README.md b/README.md
index c9cf8de..f4ce4c4 100644
--- a/README.md
+++ b/README.md
@@ -18,3 +18,6 @@ in.tsv data features:
 
 expected.tsv data features:
 * Survival - whether passenger survived (1 = yes, 0 = no)
+
+## Important note
+expected.tsv file does not contain header for the "survival" column and the out.tsv also must not have header (only predictions)