add recommendation for Postgresql 11+

diff --git a/docs/admin/Installation.md b/docs/admin/Installation.md
index 6237a9d4a37b9026c4d1dd3938a6f3cb76e945b1..32fa8caad86d1e91a31f187766d66fc2a35a9f1e 100644 (file)
--- a/docs/admin/Installation.md
+++ b/docs/admin/Installation.md
@@ -37,7 +37,7 @@ For compiling:
 
 For running Nominatim:
 
-  * [PostgreSQL](https://www.postgresql.org) (9.3+)
+  * [PostgreSQL](https://www.postgresql.org) (9.3+ will work, 11+ strongly recommended)
   * [PostGIS](https://postgis.net) (2.2+)
   * [Python 3](https://www.python.org/) (3.5+)
   * [Psycopg2](https://www.psycopg.org) (2.7+)