--- a/postgres.rst	Sun Dec 30 09:09:05 2018 +0200
+++ b/postgres.rst	Sun Dec 30 14:08:23 2018 +0200
@@ -35,6 +35,19 @@
 https://wiki.debian.org/PostgreSql
   Debian wiki instructions.
 
+Check version
+=============
+
+By SQL query::
+
+  SELECT version();
+  SHOW server_version;
+  SHOW server_version_num;
+
+From executable::
+
+  $ postgres -V
+
 Check locations
 ===============
 ::