add explanation comment

Author: obelghitialaoui

lib/parser.js

@@ -51,6 +51,7 @@ function Parser(_app) {
         }
     });
 
+    // check app.options.filterBy and define the tag to filer by
     if (app.options.filterBy) {
         var tag = app.options.filterBy.split('=')[0];
         filterTag = (tag.indexOf('api') !== -1) ? tag : null;
@@ -416,6 +417,7 @@ Parser.prototype._findBlocks = function() {
  */
 Parser.prototype._findBlockWithApiGetIndex = function(blocks) {
     var foundIndexes = [];
+    // get value to filter by
     var valueTofilter = (filterTag) ? app.options.filterBy.split('=')[1] : null;
     for (var i = 0; i < blocks.length; i += 1) {
         var found = false;
@@ -435,8 +437,10 @@ Parser.prototype._findBlockWithApiGetIndex = function(blocks) {
                 found = false;
                 break;
             }
-            
+
+            // check if the user want to filter by some specifique tag
             if (filterTag) {
+                // we need to add all apidefine
                 if (blocks[i][j].name.substr(0, 9) === 'apidefine') {
                     isDefine = true;
                 }