diff --git a/src/js/index.js b/src/js/index.js
index 5cb7b2233..e206c1ab7 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -281,9 +281,9 @@ app.filter('prettyDomains', function () {
     };
 });
 
+// we use 1024 unit in memory limit in manifest
 app.filter('prettyMemory', function () {
     return function (memory) {
-        // Adjust the default memory limit if it changes
         return memory ? Math.floor(memory / 1024 / 1024) : 256;
     };
 });
diff --git a/src/views/graphs.js b/src/views/graphs.js
index 07f1abf0b..09c9215ea 100644
--- a/src/views/graphs.js
+++ b/src/views/graphs.js
@@ -17,6 +17,7 @@ angular.module('Application').controller('GraphsController', ['$scope', '$locati
 
     $scope.installedApps = Client.getInstalledApps();
 
+    // we use 1024 to match free -m output (which is not si units)
     function bytesToMegaBytes(value) {
         return (value/1024/1024).toFixed(2);
     }