diff --git a/ctree.h b/ctree.h
index 569504e3..8fed41e3 100644
--- a/ctree.h
+++ b/ctree.h
@@ -191,7 +191,7 @@ struct btrfs_file_extent_item {
 	__le64 disk_blocknr;
 	__le64 disk_num_blocks;
 	/*
-	 * the logical offset in file bytes (no csums)
+	 * the logical offset in file blocks (no csums)
 	 * this extent record is for.  This allows a file extent to point
 	 * into the middle of an existing extent on disk, sharing it
 	 * between two snapshots (useful if some bytes in the middle of the
diff --git a/print-tree.c b/print-tree.c
index 5259b6e9..5fa8d8a5 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -15,6 +15,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 	struct btrfs_dir_item *di;
 	struct btrfs_inode_map_item *mi;
 	struct btrfs_inode_item *ii;
+	struct btrfs_file_extent_item *fi;
 	u32 type;
 
 	printf("leaf %Lu ptrs %d free space %d parent %Lu generation %Lu\n",
@@ -67,6 +68,16 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 			       btrfs_disk_key_flags(&mi->key),
 			       btrfs_disk_key_offset(&mi->key));
 			break;
+		case BTRFS_EXTENT_DATA_KEY:
+			fi = btrfs_item_ptr(l, i,
+					    struct btrfs_file_extent_item);
+			printf("\t\textent data disk block %Lu nr %Lu\n",
+			       btrfs_file_extent_disk_blocknr(fi),
+			       btrfs_file_extent_disk_num_blocks(fi));
+			printf("\t\textent data offset %Lu nr %Lu\n",
+			       btrfs_file_extent_offset(fi),
+			       btrfs_file_extent_num_blocks(fi));
+			break;
 		case BTRFS_STRING_ITEM_KEY:
 			printf("\t\titem data %.*s\n", btrfs_item_size(item),
 				btrfs_leaf_data(l) + btrfs_item_offset(item));