diff --git a/[refs] b/[refs]
index f5100a13f183..9bc71b4afd64 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e089f05c18ab36ed5fa7e2319052e03ab800d518
+refs/heads/master: 4068947886f2d2a4c192941397bacd014a04b804
diff --git a/trunk/fs/btrfs/ctree.c b/trunk/fs/btrfs/ctree.c
index 17a3ff2f1828..32922643b5bc 100644
--- a/trunk/fs/btrfs/ctree.c
+++ b/trunk/fs/btrfs/ctree.c
@@ -294,6 +294,10 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 		parent_buf = path->nodes[level + 1];
 	pslot = path->slots[level + 1];
 
+	/*
+	 * deal with the case where there is only one pointer in the root
+	 * by promoting the node below to a root
+	 */
 	if (!parent_buf) {
 		struct btrfs_buffer *child;
 		u64 blocknr = mid_buf->blocknr;
@@ -1043,6 +1047,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 	int ret;
 	int wret;
 
+	/* first try to make some room by pushing left and right */
 	wret = push_leaf_left(trans, root, path, data_size);
 	if (wret < 0)
 		return wret;