diff --git a/docs/postgres.rst b/docs/postgres.rst
index b592801e9386..904942ec74fe 100644
--- a/docs/postgres.rst
+++ b/docs/postgres.rst
@@ -1,6 +1,8 @@
 Using Postgres
 --------------
 
+Postgres version 9.4 or later is known to work.
+
 Set up database
 ===============