diff --git a/app/controllers/api/v1/notifications_controller.rb b/app/controllers/api/v1/notifications_controller.rb
index 5fad84cfd..139f456c2 100644
--- a/app/controllers/api/v1/notifications_controller.rb
+++ b/app/controllers/api/v1/notifications_controller.rb
@@ -3,6 +3,8 @@
 module Api
   module V1
     class NotificationsController < Api::V1::BaseController
+      BOOLEAN_TYPE = ActiveModel::Type::Boolean.new
+
       before_action do
         require_access_token %w[notifications]
       end
@@ -24,25 +26,25 @@ module Api
       def index
         after_date = Date.iso8601(params[:only_after]) if params.has_key?(:only_after)
 
-        notifications_query = service.index(params[:only_unread], after_date)
+        notifications_query = service.index(BOOLEAN_TYPE.cast(params[:only_unread]), after_date)
         notifications_page = time_pager(notifications_query).response
         notifications_page[:data] = notifications_page[:data].map do |note|
           NotificationPresenter.new(note, default_serializer_options).as_api_json
         end
         render_paged_api_response notifications_page
       rescue ArgumentError
-        render_error 422, "Couldnt process the notifications requestt process the notifications request"
+        render_error 422, "Could not process the notifications request"
       end
 
       def update
-        read = ActiveModel::Type::Boolean.new.cast(params.require(:read))
+        read = BOOLEAN_TYPE.cast(params.require(:read))
         if service.update_status_by_guid(params[:id], read)
           head :no_content
         else
-          render_error 422, "Couldnt process the notifications requestt process the notifications request"
+          render_error 422, "Could not process the notifications request"
         end
       rescue ActionController::ParameterMissing
-        render_error 422, "Couldnt process the notifications requestt process the notifications request"
+        render_error 422, "Could not process the notifications request"
       end
 
       private
diff --git a/spec/integration/api/notifications_controller_spec.rb b/spec/integration/api/notifications_controller_spec.rb
index d362bb354..d61eba2b0 100644
--- a/spec/integration/api/notifications_controller_spec.rb
+++ b/spec/integration/api/notifications_controller_spec.rb
@@ -62,6 +62,20 @@ describe Api::V1::NotificationsController do
         expect(notification.length).to eq(1)
       end
 
+      it "with proper credentials and unread only explicitly false" do
+        @notification.set_read_state(true)
+        get(
+          api_v1_notifications_path,
+          params: {only_unread: false, access_token: access_token}
+        )
+        expect(response.status).to eq(200)
+        notifications = response_body_data(response)
+        expect(notifications.length).to eq(2)
+        confirm_notification_format(notifications[1], @notification, "also_commented", nil)
+
+        expect(notifications.to_json).to match_json_schema(:api_v1_schema, fragment: "#/definitions/notifications")
+      end
+
       it "with proper credentials and after certain date" do
         get(
           api_v1_notifications_path,
@@ -87,7 +101,7 @@ describe Api::V1::NotificationsController do
           api_v1_notifications_path,
           params: {only_after: "January 1, 2018", access_token: access_token}
         )
-        confirm_api_error(response, 422, "Couldnt process the notifications requestt process the notifications request")
+        confirm_api_error(response, 422, "Could not process the notifications request")
       end
 
       it "with insufficient credentials" do
@@ -190,7 +204,7 @@ describe Api::V1::NotificationsController do
           api_v1_notification_path("999_999_999"),
           params: {access_token: access_token}
         )
-        confirm_api_error(response, 422, "Couldnt process the notifications requestt process the notifications request")
+        confirm_api_error(response, 422, "Could not process the notifications request")
       end
 
       it "with proper missing read field" do
@@ -198,7 +212,7 @@ describe Api::V1::NotificationsController do
           api_v1_notification_path(@notification.guid),
           params: {access_token: access_token}
         )
-        confirm_api_error(response, 422, "Couldnt process the notifications requestt process the notifications request")
+        confirm_api_error(response, 422, "Could not process the notifications request")
       end
 
       it "with insufficient credentials" do