diff --git a/src/databases/vectordb/ivf-hnsw.md b/src/databases/vectordb/ivf-hnsw.md
index 504d40a..4333a40 100644
--- a/src/databases/vectordb/ivf-hnsw.md
+++ b/src/databases/vectordb/ivf-hnsw.md
@@ -1,4 +1,4 @@
-### [Revisiting the Inverted Indices for Billion-Scale Approximate Nearest Neighbors](/assets/pdfs/hnsw_1603.09320.pdf)
+### [Revisiting the Inverted Indices for Billion-Scale Approximate Nearest Neighbors](/assets/pdfs/ivf-hnsw_1802.02422.pdf)
 
 > https://arxiv.org/abs/1802.02422