# Comment Lines

The comment lines allowed in circom 2.0 are similar to other programming languages like C or C++.

You can write comments on a single line by using //:

//Using this, we can comment a line.


You can also write a comment at the end of a code line using //:

template example(){
signal input in;   //This is an input signal.
signal output out; //This is an output signal.
}


Finally, you can write comments that span multiple lines using /* and */:

/*
All these lines will be
ignored by the compiler.
*/