diff --git a/lib/client.js b/lib/client.js
index c767373..9499d94 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -34,10 +34,10 @@ class Client {
     this.transports = options.transports || [new transports.HTTPTransport(transportOptions)]
   }
 
-  action (document, keys, params = {}) {
+  action (document, keys, params = {}, customQueryParams = {}) {
     const link = lookupLink(document, keys)
     const transport = utils.determineTransport(this.transports, link.url)
-    return transport.action(link, this.decoders, params)
+    return transport.action(link, this.decoders, params, customQueryParams)
   }
 
   get (url) {
diff --git a/lib/transports/http.js b/lib/transports/http.js
index 07a0259..f601411 100644
--- a/lib/transports/http.js
+++ b/lib/transports/http.js
@@ -27,10 +27,10 @@ class HTTPTransport {
     this.responseCallback = options.responseCallback
   }
 
-  buildRequest (link, decoders, params = {}) {
+  buildRequest (link, decoders, params = {}, customQueryParams = {}) {
     const fields = link.fields
     const method = link.method.toUpperCase()
-    let queryParams = {}
+    let queryParams = customQueryParams
     let pathParams = {}
     let formParams = {}
     let fieldNames = []
@@ -113,9 +113,9 @@ class HTTPTransport {
     }
   }
 
-  action (link, decoders, params = {}) {
+  action (link, decoders, params = {}, customQueryParams = {}) {
     const responseCallback = this.responseCallback
-    const request = this.buildRequest(link, decoders, params)
+    const request = this.buildRequest(link, decoders, params, customQueryParams)
 
     if (this.requestCallback) {
       this.requestCallback(request)