diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 3f78d3c..fe58cab 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -974,9 +974,9 @@ typedef struct MDB_db {
 	pgno_t		md_root;		/**< the root page of this tree */
 } MDB_db;
 
-	/** mdb_dbi_open flags */
 #define MDB_VALID	0x8000		/**< DB handle is valid, for me_dbflags */
 #define PERSISTENT_FLAGS	(0xffff & ~(MDB_VALID))
+	/** #mdb_dbi_open() flags */
 #define VALID_FLAGS	(MDB_REVERSEKEY|MDB_DUPSORT|MDB_INTEGERKEY|MDB_DUPFIXED|\
 	MDB_INTEGERDUP|MDB_REVERSEDUP|MDB_CREATE)
 
@@ -1007,7 +1007,10 @@ typedef struct MDB_meta {
 #define	mm_psize	mm_dbs[FREE_DBI].md_pad
 	/** Any persistent environment flags. @ref mdb_env */
 #define	mm_flags	mm_dbs[FREE_DBI].md_flags
-	pgno_t		mm_last_pg;			/**< last used page in file */
+	/** Last used page in the datafile.
+	 *	Actually the file may be shorter if the freeDB lists the final pages.
+	 */
+	pgno_t		mm_last_pg;
 	volatile txnid_t	mm_txnid;	/**< txnid that committed this page */
 } MDB_meta;
 
@@ -1057,7 +1060,7 @@ struct MDB_txn {
 	 *	in this transaction, linked through #NEXT_LOOSE_PAGE(page).
 	 */
 	MDB_page	*mt_loose_pgs;
-	/* #Number of loose pages (#mt_loose_pgs) */
+	/** Number of loose pages (#mt_loose_pgs) */
 	int			mt_loose_count;
 	/** The sorted list of dirty pages we temporarily wrote to disk
 	 *	because the dirty list was full. page numbers in here are