diff --git a/ghost/job-manager/lib/assemble-bree-job.js b/ghost/job-manager/lib/assemble-bree-job.js
index 694b7acaeb..64792db5c1 100644
--- a/ghost/job-manager/lib/assemble-bree-job.js
+++ b/ghost/job-manager/lib/assemble-bree-job.js
@@ -1,6 +1,14 @@
 const isCronExpression = require('./is-cron-expression');
 
-const assemble = (when, job, data, name) => {
+/**
+ * Creates job Object compatible with bree job definition (https://github.com/breejs/bree#job-options)
+ *
+ * @param {String | Date} [at] - Date, cron or human readable schedule format
+ * @param {Function|String} job - function or path to a module defining a job
+ * @param {Object} [data] - data to be passed into the job
+ * @param {String} [name] - job name
+ */
+const assemble = (at, job, data, name) => {
     const breeJob = {
         name: name,
         // NOTE: both function and path syntaxes work with 'path' parameter
@@ -15,17 +23,17 @@ const assemble = (when, job, data, name) => {
         });
     }
 
-    if (when instanceof Date) {
+    if (at instanceof Date) {
         Object.assign(breeJob, {
-            date: when
+            date: at
         });
-    } else if (when && isCronExpression(when)) {
+    } else if (at && isCronExpression(at)) {
         Object.assign(breeJob, {
-            cron: when
+            cron: at
         });
-    } else if (when !== undefined) {
+    } else if (at !== undefined) {
         Object.assign(breeJob, {
-            interval: when
+            interval: at
         });
     }