diff --git a/zxbrainfuck/main.asm b/zxbrainfuck/main.asm
index 218f0d3..bf0fbda 100644
--- a/zxbrainfuck/main.asm
+++ b/zxbrainfuck/main.asm
@@ -43,7 +43,7 @@ src db "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<++++
 ;src db "++++[>++++++++++<-]>++.>+++++++++++++.<<++[>.<-]>>.<<+++[>.<-]>>.<<++++[>.<-]>>.<<+++++[>.<-]>>.", 0
 ; Arvorezinha with loops
 ;src db "++++++++++>++++++[>+++++++<-]>>++++++[>+>+<<-]>>[<<+>>-]+[>+>+<<-]>>[<<+>>-]<[<<->>-]<[>+>+<<-]>>[<<+>>-]<<<[>>[<<<<.>>>>-]<<<<<<.>>>>>><+[>+>+<<-]>>[<<+>>-]<[-]<<[-]<[>+>>+<<<-]>>>[<<<+>>>-]<[>+>+<<-]>>[<<<->>>-]<[>+<-]>[<+<+>>-]<<<]", 0
-; To test the "," operator
+; Input/Output test
 ;src db "++++++++++>+[,<.>.]", 0
 ; Bad Hello World! - often triggers interpreter bugs
 ;src db ">++++++++[<+++++++++>-]<.>>+>+>++>[-]+<[>[->+<<++++>]<<]>.+++++++..+++.>>+++++++.<<<[[-]<[-]>]<+++++++++++++++.>>.+++.------.--------.>>+.>++++.", 0