More comments on metadata area types.

diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index d74de9bab511316b7c4d8467a37d4204afc63e42..f42ec33f39090ed8f14747e8eb9c7920101a64e8 100644 (file)
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -205,7 +205,7 @@ struct pv_segment {
  * area information we are working with.
  */
 
-/* Include any existing PV mdas during format_instance initialisation */
+/* Include any existing PV ("on-disk") mdas during format_instance initialisation. */
 #define FMT_INSTANCE_MDAS              0x00000002U
 
 /*
@@ -215,7 +215,10 @@ struct pv_segment {
  */
 #define FMT_INSTANCE_AUX_MDAS          0x00000004U
 
-/* Include any other format-specific mdas during format_instance initialisation */
+/*
+ * Include any other format-specific mdas during format_instance initialisation.
+ * For example metadata areas used during backup/restore/archive handling.
+ */
 #define FMT_INSTANCE_PRIVATE_MDAS      0x00000008U
 
 struct format_instance {