diff --git a/openshift_images/postgresql.adoc b/openshift_images/postgresql.adoc
index 4bd64a6633a2..a6449ab91f2b 100644
--- a/openshift_images/postgresql.adoc
+++ b/openshift_images/postgresql.adoc
@@ -89,3 +89,10 @@ $ docker stop postgresql_database
 == Volumes
 
 * */var/lib/pgsql/data* - This is the database cluster directory where PostgreSQL stores database files.
+
+== Settings
+PostgreSQL settings can be configured by additional environment variables.
+
+* *POSTGRESQL_MAX_CONNECTIONS* - The maximum number of client connections allowed.
+
+* *POSTGRESQL_SHARED_BUFFERS* - Sets how much memory is dedicated to PostgreSQL to use for caching data.