From b26dc9aabe774812dedffb96c3efeb0dfd4252dc Mon Sep 17 00:00:00 2001
From: Louis Dureuil <louis@meilisearch.com>
Date: Mon, 23 Oct 2023 16:06:06 +0200
Subject: [PATCH] Explanatory code comment

---
 milli/src/update/facet/bulk.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/milli/src/update/facet/bulk.rs b/milli/src/update/facet/bulk.rs
index 297d189cd..c0b159e57 100644
--- a/milli/src/update/facet/bulk.rs
+++ b/milli/src/update/facet/bulk.rs
@@ -167,6 +167,7 @@ impl<R: std::io::Read + std::io::Seek> FacetsUpdateBulkInner<R> {
                 // then we extend the buffer with the docids bitmap
                 match database.get(wtxn, key)? {
                     Some(prev_value) => {
+                        // prev_value is the group size for level 0, followed by the previous bitmap.
                         let old_bitmap = &prev_value[1..];
                         CboRoaringBitmapCodec::merge_deladd_into(value, old_bitmap, &mut buffer)?;
                     }