diff --git a/issues_test.go b/issues_test.go
index 102575652..16f52c6a5 100644
--- a/issues_test.go
+++ b/issues_test.go
@@ -775,10 +775,12 @@ func TestAddSpentTime(t *testing.T) {
 	mux.HandleFunc("/api/v4/projects/1/issues/5/add_spent_time", func(w http.ResponseWriter, r *http.Request) {
 		testMethod(t, r, http.MethodPost)
 		testURL(t, r, "/api/v4/projects/1/issues/5/add_spent_time")
+		testBody(t, r, `{"duration":"1h","summary":"test"}`)
 		fmt.Fprint(w, `{"human_time_estimate": null, "human_total_time_spent": "1h", "time_estimate": 0, "total_time_spent": 3600}`)
 	})
 	addSpentTimeOpt := &AddSpentTimeOptions{
 		Duration: String("1h"),
+		Summary:  String("test"),
 	}
 
 	timeState, _, err := client.Issues.AddSpentTime("1", 5, addSpentTimeOpt)
diff --git a/time_stats.go b/time_stats.go
index c1256b965..0ce2d6751 100644
--- a/time_stats.go
+++ b/time_stats.go
@@ -104,6 +104,7 @@ func (s *timeStatsService) resetTimeEstimate(pid interface{}, entity string, iss
 // GitLab docs: https://docs.gitlab.com/ee/workflow/time_tracking.html
 type AddSpentTimeOptions struct {
 	Duration *string `url:"duration,omitempty" json:"duration,omitempty"`
+	Summary  *string `url:"summary,omitempty" json:"summary,omitempty"`
 }
 
 // addSpentTime adds spent time for a single project issue.