diff --git a/clock.go b/clock.go
index 07fcf17..7783201 100644
--- a/clock.go
+++ b/clock.go
@@ -167,12 +167,12 @@ func (m *Mock) Now() time.Time {
 	return m.now
 }
 
-// Since returns time since t, using the mock clock's wall time.
+// Since returns time since `t` using the mock clock's wall time.
 func (m *Mock) Since(t time.Time) time.Duration {
 	return m.Now().Sub(t)
 }
 
-// Until returns time until t, using the mock clock's wall time.
+// Until returns time until `t` using the mock clock's wall time.
 func (m *Mock) Until(t time.Time) time.Duration {
 	return t.Sub(m.Now())
 }
diff --git a/clock_test.go b/clock_test.go
index ce5e42a..b587af7 100644
--- a/clock_test.go
+++ b/clock_test.go
@@ -300,11 +300,11 @@ func TestMock_Until(t *testing.T) {
 
 	end := clock.Now().Add(500 * time.Second)
 	if dur := clock.Until(end); dur.Seconds() != 500 {
-		t.Fatalf("expected 500 to the end, actually: %v", dur.Seconds())
+		t.Fatalf("expected 500s duration between `clock` and `end`, actually: %v", dur.Seconds())
 	}
 	clock.Add(100 * time.Second)
 	if dur := clock.Until(end); dur.Seconds() != 400 {
-		t.Fatalf("expected 400 to the end, actually: %v", dur.Seconds())
+		t.Fatalf("expected 400s duration between `clock` and `end`, actually: %v", dur.Seconds())
 	}
 }