diff --git a/src/init.js b/src/init.js
index f4ff3a4..a0cefae 100644
--- a/src/init.js
+++ b/src/init.js
@@ -226,6 +226,12 @@ async function initializeMongoDb() {
     // provided by the IDV provider). The possible values of status are:
     // 'NEEDS_PAYMENT' | 'IN_PROGRESS' | 'ISSUED' | 'VERIFICATION_FAILED' | 'REFUNDED'
     status: String,
+    // frontendDomain allows mods to change their suggestions based on whether the domain
+    // is old Holonym or Holonym-within-Silk.
+    frontendDomain: {
+      type: String, // "app.holonym.id" | "silksecure.net"
+      required: false,
+    },
     deletedFromIDVProvider: {
       type: Boolean,
       required: false,
diff --git a/src/services/admin/user-sessions.js b/src/services/admin/user-sessions.js
index 3f50dc6..25c835a 100644
--- a/src/services/admin/user-sessions.js
+++ b/src/services/admin/user-sessions.js
@@ -59,6 +59,7 @@ async function userSessions(req, res) {
       refundTxHash: s.refundTxHash,
       check_id: s.check_id,
       sessionId: s.sessionId,
+      frontendDomain: s.frontendDomain,
       sid: s._id.toString(),
     }));
 
diff --git a/src/services/sessions/endpoints.js b/src/services/sessions/endpoints.js
index c567c1d..ecf3b10 100644
--- a/src/services/sessions/endpoints.js
+++ b/src/services/sessions/endpoints.js
@@ -102,10 +102,18 @@ async function postSession(req, res) {
         .json({ error: "idvProvider must be one of 'veriff', 'idenfy', 'onfido'" });
     }
 
+    let domain = null;
+    if (req.body.domain === "app.holonym.id") {
+      domain = "app.holonym.id";
+    } else if (req.body.domain === "silksecure.net") {
+      domain = "silksecure.net";
+    }
+
     const session = new Session({
       sigDigest: sigDigest,
       idvProvider: idvProvider,
       status: sessionStatusEnum.NEEDS_PAYMENT,
+      frontendDomain: domain,
     });
     await session.save();