diff --git a/app/migrations/20140630132510-instance-evidence.js b/app/migrations/20140630132510-instance-evidence.js
new file mode 100644
index 0000000..b05ba9d
--- /dev/null
+++ b/app/migrations/20140630132510-instance-evidence.js
@@ -0,0 +1,14 @@
+var dbm = require('db-migrate');
+var type = dbm.dataType;
+
+exports.up = function(db, callback) {
+  db.runSql("ALTER TABLE `badgeInstances` "
+          + "  ADD `evidenceUrl` VARCHAR(255) "
+          , callback);
+};
+
+exports.down = function(db, callback) {
+  db.runSql("ALTER TABLE `badgeInstances` "
+          + "  DROP COLUMN `evidenceUrl` "
+          , callback);
+};
diff --git a/app/models/badge-instance.js b/app/models/badge-instance.js
index 34e44d6..6eed83d 100644
--- a/app/models/badge-instance.js
+++ b/app/models/badge-instance.js
@@ -15,6 +15,7 @@ const BadgeInstances = db.table('badgeInstances', {
     'issuedOn',
     'expires',
     'claimCode',
+    'evidenceUrl',
     'badgeId',
   ],
   relationships: {
@@ -34,6 +35,7 @@ BadgeInstances.formatUserInput = function formatUserInput(obj) {
     issuedOn: obj.issuedOn || dateFromUnixtime(Date.now()),
     expires: obj.expires ? dateFromUnixtime(obj.expires) : null,
     claimCode: obj.claimCode,
+    evidenceUrl: obj.evidenceUrl,
   }
 }
 
@@ -47,6 +49,7 @@ BadgeInstances.toResponse = function toResponse(row, req) {
     expires: row.expires,
     issuedOn: row.issuedOn,
     claimCode: row.claimCode,
+    evidenceUrl: row.evidenceUrl,
     assertionUrl: assertionUrl,
     badge: row.badge ? row.badge.toResponse(req) : null
   }
@@ -56,6 +59,7 @@ BadgeInstances.validateRow = makeValidator({
   id: optional('isInt'),
   email: required('isEmail'),
   claimCode: optional('len', 0, 255),
+  evidenceUrl: optional('isUrl'),
   badgeId: required('isInt'),
 })
 
diff --git a/app/routes/badge-instances.js b/app/routes/badge-instances.js
index 7776748..fc9ac1f 100644
--- a/app/routes/badge-instances.js
+++ b/app/routes/badge-instances.js
@@ -157,6 +157,7 @@ exports = module.exports = function applyBadgeRoutes (server) {
         email: instance.email,
         assertionUrl: instance.assertionUrl,
         issuedOn: unixtimeFromDate(instance.issuedOn),
+        evidenceUrl: instance.evidenceUrl,
         comment: comment
       }
     }
@@ -181,7 +182,7 @@ exports = module.exports = function applyBadgeRoutes (server) {
           next()
 
           const comment = req.body.comment || null;
-          hookData.push(instanceToHookData(instance))
+          hookData.push(instanceToHookData(instance, comment))
 
           return Milestones.findAndAward(instance.email, badge);
         })
@@ -448,6 +449,7 @@ exports = module.exports = function applyBadgeRoutes (server) {
         type: 'hosted',
       },
       issuedOn: unixtimeFromDate(instance.issuedOn),
+      evidence: instance.evidenceUrl, 
       expires: unixtimeFromDate(instance.expires),
     }
   }