--- a/postgres.rst	Thu Jan 03 21:52:00 2019 +0200
+++ b/postgres.rst	Thu Jan 03 22:03:33 2019 +0200
@@ -347,3 +347,23 @@
 https://jdbc.postgresql.org/download.html
   Java/JDBC/Postgres compatibility table.
 
+plpgsql
+=======
+
+Simple function::
+
+  CREATE OR REPLACE FUNCTION incx(x INTEGER)
+  RETURNS INTEGER STABLE AS $$
+    BEGIN
+      RETURN x + 1;
+    END;
+  $$ LANGUAGE plpgsql;
+
+Support for procedures is added only in Postgres v11.
+
+https://www.postgresql.org/docs/current/sql-createfunction.html
+  ``CREATE FUNCTION``.
+https://www.postgresql.org/docs/current/plpgsql-control-structures.html
+  plpgsql control structures.
+https://www.postgresql.org/docs/current/errcodes-appendix.html
+  PostgreSQL Error Codes.
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