diff --git a/docs/postgres.rst b/docs/postgres.rst
index b592801e93863efba0283cd92251f90e7bbeca75..904942ec74feeae816470ee135d9887af0cd333d 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
 ===============