diff --git a/README.md b/README.md
index 70072b9..1b11e42 100644
--- a/README.md
+++ b/README.md
@@ -138,7 +138,7 @@ curl -d '{"variables":[{"variable_type": "concept", "concept_id": 2000000324},{"
 
 Histogram endpoint:
 ```bash
-curl -d '{"variables":[{"variable_type": "custom_dichotomous", "cohort_ids": [1, 4]}]}' -H "Content-Type: application/json" -X POST http://localhost:8080/histogram/by-source-id/1/by-cohort-definition-id/4/by-histogram-concept-id/2000006885
+curl -d '{"variables":[{"variable_type": "custom_dichotomous", "cohort_ids": [1, 4]}, {"variable_type": "concept", "concept_id": 2000006885}]}' -H "Content-Type: application/json" -X POST http://localhost:8080/histogram/by-source-id/1/by-cohort-definition-id/4
 ```
 
 # Deployment steps
diff --git a/server/router.go b/server/router.go
index 7997d0e..5eda8f0 100644
--- a/server/router.go
+++ b/server/router.go
@@ -57,7 +57,7 @@ func NewRouter() *gin.Engine {
 		authorized.POST("/cohort-stats/by-source-id/:sourceid/by-cohort-definition-id/:cohortid/by-concept-id/:conceptid", cohortData.RetrieveStatsForCohortIdAndConceptId)
 
 		// histogram endpoint
-		authorized.POST("/histogram/by-source-id/:sourceid/by-cohort-definition-id/:cohortid/by-histogram-concept-id/:histogramid", cohortData.RetrieveHistogramForCohortIdAndConceptId)
+		authorized.POST("/histogram/by-source-id/:sourceid/by-cohort-definition-id/:cohortid", cohortData.RetrieveHistogramForCohortIdAndConceptId)
 
 		// Data Dictionary endpoint
 		authorized.GET("/data-dictionary/Retrieve", cohortData.RetrieveDataDictionary)