note ig <p>When you [doc://use] your module, [doc://use] [doc://require]'s your module. This is explained in the documentation for [doc://use].</p> <p>[doc://require] includes your module by evaluating it with [doc://do]. This is explained in the documentation for [doc://require].</p> <p>If your module compiles successfully, [doc://do] returns the value of the last expression evaluated. When you end your module with <b>1;</b>, this value is 1. This is explained in the documentation for [doc://do].</p> <p>[doc://require] checks the value returned by [doc://do] and if it is false it dies with the error <i>$filename did not return true value</i>, where $filename is the full path name of the file being loaded (your module).</p> <p>So, as others have pointed out, it is not necessary that your module end with <b>1;</b> but if you want to include it with [doc://use] or [doc://require] then the last expression evaluated must have a true value. Ending modules with <b>1;</b> is merely a convention to ensure they return a true value.</p> <p>Note that you can include a module that ends with <b>0;</b> (or any other expression that evaluates to a false value. You can't include it using [doc://use] or [doc://require], but you can use [doc://do] and ignore the return value or load the content into a scalar and use [doc://eval] to evaluate the scalar and, again, ignore the return value.</p> 781320 781320