diff --git a/meilisearch/models/index.py b/meilisearch/models/index.py
index 0b3872f9..df7f62c9 100644
--- a/meilisearch/models/index.py
+++ b/meilisearch/models/index.py
@@ -36,6 +36,8 @@ class IndexStats(CamelBase):
     number_of_documents: int
     is_indexing: bool
     field_distribution: FieldDistribution
+    index_size: int | None = None
+    used_index_size: int | None = None
     internal_database_sizes: dict[str, Any] | None = None
 
     @field_validator("field_distribution", mode="before")