Explainatory comment.

source-map-support.js

@@ -110,6 +110,8 @@ function retrieveSourceMap(source) {
 }
 
 function mapSourcePosition(position) {
+  // Fix position in Node where some (internal) code is prepended.
+  // See https://github.com/evanw/node-source-map-support/issues/36
   if (!isInBrowser() && position.line === 1) {
     position.column -= 62
   }