From 847a32340da6ee439e8a9e2217c6ef1f1f86eaa1 Mon Sep 17 00:00:00 2001
From: Raul Marin <git@rmr.ninja>
Date: Wed, 8 Nov 2017 16:47:33 +0100
Subject: [PATCH] Update CONTRIBUTING with information about PG function labels

---
 CONTRIBUTING.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 05e969e..e478427 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,6 +5,12 @@ refactoring or bugfixing, a topic branch must be created out of the `develop`.
 
 Modifications are done inside `src/pg/sql` and `src/py/crankshaft`.
 
+When adding a new PostgreSQL function or modifying an exiting one make sure that the
+[VOLATILITY](https://www.postgresql.org/docs/current/static/xfunc-volatility.html) and [PARALLEL](https://www.postgresql.org/docs/9.6/static/parallel-safety.html) categories are updated accordingly.
+As PARALLEL labels need to be stripped for incompatible PostgreSQL versions
+please use _PARALLEL SAFE/RESTRICTED/UNSAFE_ in uppercase so it's handled
+automatically.
+
 Take into account:
 
 *  Tests must be added for any new functionality