diff --git a/src/main/java/org/peergos/blockstore/CidInfiniFilter.java b/src/main/java/org/peergos/blockstore/CidInfiniFilter.java
index 4ac10e8..3cd3314 100644
--- a/src/main/java/org/peergos/blockstore/CidInfiniFilter.java
+++ b/src/main/java/org/peergos/blockstore/CidInfiniFilter.java
@@ -35,6 +35,7 @@ public static CidInfiniFilter build(Blockstore bs) {
     public static CidInfiniFilter build(Blockstore bs, double falsePositiveRate) {
         List<Cid> refs = bs.refs(false).join();
         int nBlocks = refs.size()*5/4; //  increase by 25% to avoid expansion during build
+        LOG.info("Building infini filter for " + nBlocks + " blocks with false positive rate: " + falsePositiveRate);
         CidInfiniFilter infini = build(nBlocks, falsePositiveRate);
         refs.forEach(c -> infini.add(c));
         return infini;