diff --git a/lib/http.js b/lib/http.js
index 34f4ffb..2e12ab1 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -30,7 +30,7 @@ var HTTPObject = function(engine) {
     this.states = [];
     this.variables = {
         "uuidv4": RAND.uuidv4,
-        "base64json": function(v) {
+        "base64json": function(v) {    // e.g. {base64json VARIABLE_NAME}
             return BASE64.encode(JSON.stringify(v));
         },
         "unixnow": function(diff) {    // e.g. {unixnow -300} (seconds)