diff --git a/src/MetadataService.js b/src/MetadataService.js
index e5c8fad1..d6d2b97b 100644
--- a/src/MetadataService.js
+++ b/src/MetadataService.js
@@ -58,7 +58,11 @@ export class MetadataService {
         return this._jsonService.getJson(this.metadataUrl)
             .then(metadata => {
                 Log.debug("MetadataService.getMetadata: json received");
-                this._settings.metadata = metadata;
+                
+                var mergedMetadata = this._settings.metadataSeed || {};
+                Object.assign(mergedMetadata, metadata);
+                
+                this._settings.metadata = mergedMetadata;
                 return metadata;
             });
     }
diff --git a/src/OidcClientSettings.js b/src/OidcClientSettings.js
index 1b381b39..530d4c9e 100644
--- a/src/OidcClientSettings.js
+++ b/src/OidcClientSettings.js
@@ -18,7 +18,7 @@ const DefaultClockSkewInSeconds = 60 * 5;
 export class OidcClientSettings {
     constructor({
         // metadata related
-        authority, metadataUrl, metadata, signingKeys,
+        authority, metadataUrl, metadata, signingKeys, metadataSeed,
         // client related
         client_id, client_secret, response_type = DefaultResponseType, scope = DefaultScope,
         redirect_uri, post_logout_redirect_uri,
@@ -44,6 +44,7 @@ export class OidcClientSettings {
         this._authority = authority;
         this._metadataUrl = metadataUrl;
         this._metadata = metadata;
+        this._metadataSeed = metadataSeed;
         this._signingKeys = signingKeys;
 
         this._client_id = client_id;
@@ -172,6 +173,12 @@ export class OidcClientSettings {
     set metadata(value) {
         this._metadata = value;
     }
+    get metadataSeed() {
+        return this._metadataSeed;
+    }
+    set metadataSeed(value) {
+        this._metadataSeed = value;
+    }
 
     get signingKeys() {
         return this._signingKeys;
diff --git a/test/unit/MetadataService.spec.js b/test/unit/MetadataService.spec.js
index 561c4d0a..ac597094 100644
--- a/test/unit/MetadataService.spec.js
+++ b/test/unit/MetadataService.spec.js
@@ -105,12 +105,25 @@ describe("MetadataService", function() {
 
         it("should cache metadata from json call", function(done) {
             settings.metadataUrl = "http://sts/metadata";
-            stubJsonService.result = Promise.resolve("test");
+            stubJsonService.result = Promise.resolve({test:"value"});
+
+            let p = subject.getMetadata();
+
+            p.then(result => {
+                settings.metadata.should.deep.equal({test:"value"});
+                done();
+            });
+        });
+
+        it("should merge metadata from seed", function(done) {
+            settings.metadataUrl = "http://sts/metadata";
+            settings.metadataSeed = {test1:"one"};
+            stubJsonService.result = Promise.resolve({test2:"two"});
 
             let p = subject.getMetadata();
 
             p.then(result => {
-                settings.metadata.should.equal("test");
+                settings.metadata.should.deep.equal({test1:"one", test2:"two"});
                 done();
             });
         });