diff --git a/deploy-manage/production-guidance/optimize-performance/approximate-knn-search.md b/deploy-manage/production-guidance/optimize-performance/approximate-knn-search.md
index 1124f58ec2..16e474bce8 100644
--- a/deploy-manage/production-guidance/optimize-performance/approximate-knn-search.md
+++ b/deploy-manage/production-guidance/optimize-performance/approximate-knn-search.md
@@ -51,7 +51,7 @@ Here are estimates for different element types and quantization levels:
 * `element_type: float`: `num_vectors * num_dimensions * 4`
 * `element_type: float` with `quantization: int8`: `num_vectors * (num_dimensions + 4)`
 * `element_type: float` with `quantization: int4`: `num_vectors * (num_dimensions/2 + 4)`
-* `element_type: float` with `quantization: bbq`: `num_vectors * (num_dimensions/8 + 12)`
+* `element_type: float` with `quantization: bbq`: `num_vectors * (num_dimensions/8 + 14)`
 * `element_type: byte`: `num_vectors * num_dimensions`
 * `element_type: bit`: `num_vectors * (num_dimensions/8)`