diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 705130931e9b0baf0e4ce8730d0fb1d4f0094048..4aca1ea228beb90330929f4939bee81bd2e2085a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -2482,7 +2482,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
 
           int32_t nextIndex = -1;
           SBlockIndex bIndex = {0};
-          pBlockInfo = getCurrentBlockInfo(&pReader->status.blockIter);
+          pBlockInfo = getCurrentBlockInfo(&pReader->status.blockIter);  // NOTE: get the new block info
 
           bool hasNeighbor = getNeighborBlockOfSameTable(pBlockInfo, pBlockScanInfo, &nextIndex, pReader->order, &bIndex);
           if (!hasNeighbor) {  // do nothing