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-rw-r--r--src/backend/lib/README2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/lib/README b/src/backend/lib/README
index 2f16351849d..5e5ba5e4372 100644
--- a/src/backend/lib/README
+++ b/src/backend/lib/README
@@ -3,6 +3,8 @@ in the backend:
binaryheap.c - a binary heap
+hyperloglog.c - a streaming cardinality estimator
+
pairingheap.c - a pairing heap
rbtree.c - a red-black tree