From 3eeae8ef06cbe591aa5272febc92aa3f4437c960 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mathieu=20Br=C3=A9dif?= <mathieu.bredif@ign.fr>
Date: Wed, 9 Mar 2016 16:38:39 +0100
Subject: [PATCH] readme

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index 5c6df95..0057794 100644
--- a/README.md
+++ b/README.md
@@ -447,6 +447,10 @@ Now that you have created two tables, you'll see entries for them in the `pointc
 >      - sigbits -- significant bits removal
 >      - rle -- run-length encoding
 
+**PC_PointN(p pcpatch, n int4)** returns **pcpoint**
+
+> Returns the n-th point of the patch with 1-based indexing. Negative n counts point from the end. 
+
 ## PostGIS Integration ##
 
 The `pointcloud_postgis` extension adds functions that allow you to use PostgreSQL Pointcloud with PostGIS, converting PcPoint and PcPatch to Geometry and doing spatial filtering on point cloud data. The `pointcloud_postgis` extension depends on both the `postgis` and `pointcloud` extensions, so they must be installed first: