diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index 578270394..45fc4a654 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -1900,9 +1900,10 @@ g_test_timer_start (void)
 /**
  * g_test_timer_elapsed:
  *
- * Get the time since the last start of the timer with g_test_timer_start().
+ * Get the number of seconds since the last start of the timer with
+ * g_test_timer_start().
  *
- * Returns: the time since the last start of the timer, as a double
+ * Returns: the time since the last start of the timer in seconds, as a double
  *
  * Since: 2.16
  */