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/merge_requests.go b/merge_requests.go
index 1531dfdfc..f5b68fdfa 100644
--- a/merge_requests.go
+++ b/merge_requests.go
@@ -468,7 +468,7 @@ type GetMergeRequestChangesOptions struct {
 // its files and changes.
 //
 // Deprecated: This endpoint has been replaced by
-// MergeRequestsService.ListMergeRequesDiffs()
+// MergeRequestsService.ListMergeRequestDiffs()
 //
 // GitLab API docs:
 // https://docs.gitlab.com/ee/api/merge_requests.html#get-single-merge-request-changes
@@ -493,7 +493,7 @@ func (s *MergeRequestsService) GetMergeRequestChanges(pid interface{}, mergeRequ
 	return m, resp, nil
 }
 
-// ListMergeRequestDiffsOptions represents the available ListMergeRequesDiffs()
+// ListMergeRequestDiffsOptions represents the available ListMergeRequestDiffs()
 // options.
 //
 // GitLab API docs:
diff --git a/merge_requests_test.go b/merge_requests_test.go
index 28ddf5c0f..b7301ca16 100644
--- a/merge_requests_test.go
+++ b/merge_requests_test.go
@@ -288,7 +288,7 @@ func TestGetIssuesClosedOnMerge_Jira(t *testing.T) {
 	assert.Equal(t, "Title of this issue", issues[0].Title)
 }
 
-func TestListMergeRequesDiffs(t *testing.T) {
+func TestListMergeRequestDiffs(t *testing.T) {
 	mux, client := setup(t)
 
 	mux.HandleFunc("/api/v4/projects/1/merge_requests/1/diffs", func(w http.ResponseWriter, r *http.Request) {
@@ -303,7 +303,7 @@ func TestListMergeRequesDiffs(t *testing.T) {
 
 	diffs, _, err := client.MergeRequests.ListMergeRequestDiffs(1, 1, opts)
 	if err != nil {
-		t.Errorf("MergeRequests.ListMergeRequesDiffs returned error: %v", err)
+		t.Errorf("MergeRequests.ListMergeRequestDiffs returned error: %v", err)
 	}
 
 	want := []*MergeRequestDiff{
@@ -330,7 +330,7 @@ func TestListMergeRequesDiffs(t *testing.T) {
 	}
 
 	if !reflect.DeepEqual(want, diffs) {
-		t.Errorf("MergeRequests.ListMergeRequesDiffs returned %+v, want %+v", diffs, want)
+		t.Errorf("MergeRequests.ListMergeRequestDiffs returned %+v, want %+v", diffs, want)
 	}
 }
 
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.