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diff --git a/src/backend/access/gist/README b/src/backend/access/gist/README
index 8ca0cf78cc9..25cab0047b6 100644
--- a/src/backend/access/gist/README
+++ b/src/backend/access/gist/README
@@ -10,6 +10,7 @@ GiST stands for Generalized Search Tree. It was introduced in the seminal paper
Jeffrey F. Naughton, Avi Pfeffer:
http://www.sai.msu.su/~megera/postgres/gist/papers/gist.ps
+ https://dsf.berkeley.edu/papers/sigmod97-gist.pdf
and implemented by J. Hellerstein and P. Aoki in an early version of
PostgreSQL (more details are available from The GiST Indexing Project