diff --git a/library/src/main/java/io/constructor/core/ConstructorIo.kt b/library/src/main/java/io/constructor/core/ConstructorIo.kt
index 5386552c..43a3ccbb 100755
--- a/library/src/main/java/io/constructor/core/ConstructorIo.kt
+++ b/library/src/main/java/io/constructor/core/ConstructorIo.kt
@@ -1888,9 +1888,10 @@ object ConstructorIo {
      * @param term: The term to use to refine results (strategy specific)
      * @param variationsMap specify which attributes within variations should be returned
      * @param preFilterExpression faceting expression to scope results
+     * @param hiddenFields show fields that are hidden by default
      */
-    fun getRecommendationResults(podId: String, facets: List<Pair<String, List<String>>>? = null, numResults: Int? = null, sectionName: String? = null, itemId: String? = null, term: String? = null, variationsMap: VariationsMap? = null, preFilterExpression: String? = null): Observable<ConstructorData<RecommendationsResponse>> {
-        val encodedParams: ArrayList<Pair<String, String>> = getEncodedParams(numResults = numResults, sectionName = sectionName, itemId = itemId, term = term, facets = facets, variationsMap = variationsMap, preFilterExpression = preFilterExpression)
+    fun getRecommendationResults(podId: String, facets: List<Pair<String, List<String>>>? = null, numResults: Int? = null, sectionName: String? = null, itemId: String? = null, term: String? = null, variationsMap: VariationsMap? = null, preFilterExpression: String? = null, hiddenFields: List<String>? = null): Observable<ConstructorData<RecommendationsResponse>> {
+        val encodedParams: ArrayList<Pair<String, String>> = getEncodedParams(numResults = numResults, sectionName = sectionName, itemId = itemId, term = term, facets = facets, variationsMap = variationsMap, preFilterExpression = preFilterExpression, hiddenFields = hiddenFields)
 
         return dataManager.getRecommendationResults(podId, encodedParams = encodedParams.toTypedArray())
     }
@@ -1920,8 +1921,8 @@ object ConstructorIo {
      * @param variationsMap specify which attributes within variations should be returned
      * @param preFilterExpression faceting expression to scope results
      */
-    suspend fun getRecommendationResultsCRT(podId: String, facets: List<Pair<String, List<String>>>? = null, numResults: Int? = null, sectionName: String? = null, itemId: String? = null, term: String? = null, variationsMap: VariationsMap? = null, preFilterExpression: String? = null): RecommendationsResponse {
-        val encodedParams: ArrayList<Pair<String, String>> = getEncodedParams(numResults = numResults, sectionName = sectionName, itemId = itemId, term = term, facets = facets, variationsMap = variationsMap, preFilterExpression = preFilterExpression)
+    suspend fun getRecommendationResultsCRT(podId: String, facets: List<Pair<String, List<String>>>? = null, numResults: Int? = null, sectionName: String? = null, itemId: String? = null, term: String? = null, variationsMap: VariationsMap? = null, preFilterExpression: String? = null, hiddenFields: List<String>? = null): RecommendationsResponse {
+        val encodedParams: ArrayList<Pair<String, String>> = getEncodedParams(numResults = numResults, sectionName = sectionName, itemId = itemId, term = term, facets = facets, variationsMap = variationsMap, preFilterExpression = preFilterExpression, hiddenFields = hiddenFields)
 
         return dataManager.getRecommendationResultsCRT(podId, encodedParams = encodedParams.toTypedArray())
     }
@@ -1956,7 +1957,7 @@ object ConstructorIo {
      * @param preFilterExpression faceting expression to scope results
      */
     fun getRecommendationResults(request: RecommendationsRequest): Observable<ConstructorData<RecommendationsResponse>> {
-        val encodedParams: ArrayList<Pair<String, String>> = getEncodedParams(facets = request.filters?.toList(), itemIds = request.itemIds, term = request.term, numResults = request.numResults, sectionName = request.section, variationsMap = request.variationsMap, preFilterExpression = request.preFilterExpression)
+        val encodedParams: ArrayList<Pair<String, String>> = getEncodedParams(facets = request.filters?.toList(), itemIds = request.itemIds, term = request.term, numResults = request.numResults, sectionName = request.section, variationsMap = request.variationsMap, preFilterExpression = request.preFilterExpression, hiddenFields = request.hiddenFields)
 
         return dataManager.getRecommendationResults(request.podId, encodedParams = encodedParams.toTypedArray())
     }
diff --git a/library/src/main/java/io/constructor/data/builder/RecommendationsRequest.kt b/library/src/main/java/io/constructor/data/builder/RecommendationsRequest.kt
index 69b73824..81dfa738 100644
--- a/library/src/main/java/io/constructor/data/builder/RecommendationsRequest.kt
+++ b/library/src/main/java/io/constructor/data/builder/RecommendationsRequest.kt
@@ -12,6 +12,7 @@ class RecommendationsRequest (
     val term: String? = null,
     val numResults: Int? = null,
     val section: String? = null,
+    val hiddenFields: List<String>? = null,
     val variationsMap: VariationsMap? = null,
     val preFilterExpression: String? = null,
 ) {
@@ -22,6 +23,7 @@ class RecommendationsRequest (
         builder.term,
         builder.numResults,
         builder.section,
+        builder.hiddenFields,
         builder.variationsMap,
         builder.preFilterExpression,
     )
@@ -38,6 +40,7 @@ class RecommendationsRequest (
         var itemIds: List<String>? = null
         var term: String? = null
         var section: String? = null
+        var hiddenFields: List<String>? = null
         var variationsMap: VariationsMap? = null
         var preFilterExpression: String? = null
 
@@ -46,6 +49,7 @@ class RecommendationsRequest (
         fun setTerm(term: String): Builder = apply { this.term = term }
         fun setNumResults(numResults: Int): Builder = apply { this.numResults = numResults }
         fun setSection(section: String): Builder = apply { this.section = section }
+        fun setHiddenFields(hiddenFields: List<String>): Builder = apply { this.hiddenFields = hiddenFields }
         fun setVariationsMap(variationsMap: VariationsMap): Builder = apply { this.variationsMap = variationsMap }
         fun setPreFilterExpression(preFilterExpression: String): Builder = apply { this.preFilterExpression = preFilterExpression }
         fun build(): RecommendationsRequest = RecommendationsRequest(this)
diff --git a/library/src/test/java/io/constructor/core/ConstructorIoRecommendationsTest.kt b/library/src/test/java/io/constructor/core/ConstructorIoRecommendationsTest.kt
index 8ca7c2dd..609e5be5 100644
--- a/library/src/test/java/io/constructor/core/ConstructorIoRecommendationsTest.kt
+++ b/library/src/test/java/io/constructor/core/ConstructorIoRecommendationsTest.kt
@@ -253,4 +253,49 @@ class ConstructorIoRecommendationsTest {
             }
         }
     }
+
+    @Test
+    fun getRecommendationResultsWithHiddenFieldsUsingBuilder() {
+        val mockResponse = MockResponse().setResponseCode(200).setBody(TestDataLoader.loadAsString("recommendation_response.json"))
+        mockServer.enqueue(mockResponse)
+        val hiddenFields = listOf("hiddenField1", "hiddenField2")
+        val recommendationsRequest = RecommendationsRequest.Builder("titanic")
+        .setHiddenFields(hiddenFields)
+        .build()
+
+        val observer = constructorIo.getRecommendationResults(recommendationsRequest).test()
+
+        observer.assertComplete().assertValue {
+            var recommendationResponse = it.get()
+            recommendationResponse?.response?.results?.isNotEmpty()!!
+        }
+        observer.assertNoErrors()
+
+        val request = mockServer.takeRequest()
+                assertThat(request.requestUrl!!.encodedPath).isEqualTo("/recommendations/v1/pods/titanic")
+        with(request.requestUrl!!) {
+            val queryParams = mapOf(
+                    "fmt_options[hidden_fields]" to hiddenFields,
+                    "key" to "golden-key",
+                    "i" to "guido-the-guid",
+                    "ui" to "player-one",
+                    "s" to "79",
+                    "c" to "cioand-2.31.1",
+                    "_dt" to "1"
+            )
+            assertThat(queryParameterNames).containsExactlyInAnyOrderElementsOf(queryParams.keys)
+
+            queryParams.forEach { (key, value) ->
+                if (key == "fmt_options[hidden_fields]") {
+                    assertThat(queryParameterValues(key)).containsExactlyInAnyOrderElementsOf(
+                        hiddenFields
+                    )
+                } else if (key == "_dt") {
+                    assertThat(queryParameter(key)).containsOnlyDigits()
+                } else {
+                    assertThat(queryParameter(key)).isEqualTo(value)
+                }
+            }
+        }
+    }
 }