diff --git a/gio/gvolume.c b/gio/gvolume.c
index 4530701a6..64229b88f 100644
--- a/gio/gvolume.c
+++ b/gio/gvolume.c
@@ -532,9 +532,9 @@ g_volume_enumerate_identifiers (GVolume *volume)
  *   GFile *mount_root
  *   GFile *volume_activation_root;
  *
- *   mount = g_volume_get_mount (volume); // mounted, so never NULL
+ *   mount = g_volume_get_mount (volume); /* mounted, so never NULL */
  *   mount_root = g_mount_get_root (mount);
- *   volume_activation_root = g_volume_get_activation_root(volume); // assume not NULL
+ *   volume_activation_root = g_volume_get_activation_root(volume); /* assume not NULL */
  * </programlisting>
  *
  * then the expression