diff --git a/controllers/gdd_controller.go b/controllers/gdd_controller.go
index c99ab81181631c137e1bcc05792c8b8d52bae150..1703d22196423bf1dfb979a88b4a3412195ea592 100644
--- a/controllers/gdd_controller.go
+++ b/controllers/gdd_controller.go
@@ -21,7 +21,7 @@ var GetGddValues = services.GetGddValues
 // @Failure 400 {object} errors.StandardError
 // @Failure 404 {object} errors.StandardError
 // @Failure 500 {object} errors.StandardError
-// @Param year query int true "Year to get gdd for"
+// @Param year query int false "Year to get gdd for"
 // @Param product query string true "Crop to calculate gdd for" Enums(corn)
 // @Param latitude query number true "Latitude to search for"
 // @Param longitude query number true "Longitude to search for"