diff --git a/subjects/concat2args/README.md b/subjects/concat2args/README.md
index e55423083..6af3e33ff 100644
--- a/subjects/concat2args/README.md
+++ b/subjects/concat2args/README.md
@@ -4,8 +4,9 @@
 
 Write a program that concatenates two arguments and prints the result:
 
-- If the number of arguments is not 2, return newline.
-- If the two arguments are empty return newline.  
+- If the number of arguments is not 2, return a newline.
+- If only one of the arguments is empty, print the other.
+- If the two arguments are empty return a newline.  
 
 ### Usage