diff --git a/check.c b/check.c
index 709447c4..272c4402 100644
--- a/check.c
+++ b/check.c
@@ -364,9 +364,9 @@ static int repair(struct snapraid_state* state, int rehash, unsigned pos, unsign
 			/* If the block is CHG or DELETED, we don't have the original content of block, */
 			/* and we must try to recover it. */
 			/* This apply to CHG blocks even if they are not marked bad, */
-			/* because the parityis computed with old content, and not with the new one. */
+			/* because the parity is computed with old content, and not with the new one. */
 			/* Note that this recovering is done just to make possible to recover any other BLK one, */
-			/* we are not really interseted in DELETED and CHG (old version) ones. */
+			/* we are not really interested in DELETED and CHG (old version) ones. */
 
 			/* try to fetch the old block using the old hash */
 			if (state_import_fetch(state, rehash, failed[j].block->hash, buffer[failed[j].index]) == 0) {
diff --git a/elem.h b/elem.h
index e490bcbf..88212934 100644
--- a/elem.h
+++ b/elem.h
@@ -100,10 +100,12 @@ struct snapraid_filter {
  * This block is a deleted one.
  * This happens when a file is deleted.
  *
- * The block hash field IS set, and it represents the hash of the previous data.
+ * The block hash field IS set, and it represents the hash of the previous data, but only
+ * if it's different by all 0.
  * The parity for this disk is not updated, but it contains the old data referenced by the hash.
  *
- * If the hash is completely filled with 0, it means that its lost.
+ * If the hash is completely filled with 0, it means that the hash is lost.
+ * This could happen if a NEW block is deleted in an interrupted sync.
  */
 #define BLOCK_STATE_DELETED 4