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-rw-r--r--pack-objects.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/pack-objects.h b/pack-objects.h
index 9d0391c173..e4ea6a350c 100644
--- a/pack-objects.h
+++ b/pack-objects.h
@@ -32,7 +32,9 @@ enum dfs_state {
*
* "size" is the uncompressed object size. Compressed size of the raw
* data for an object in a pack is not stored anywhere but is computed
- * and made available when reverse .idx is made.
+ * and made available when reverse .idx is made. Note that when a
+ * delta is reused, "size" is the uncompressed _delta_ size, not the
+ * canonical one after the delta has been applied.
*
* "hash" contains a path name hash which is used for sorting the
* delta list and also during delta searching. Once prepare_pack()