From 07d4e333f03a89c7559e61a3c3dba92d153c31aa Mon Sep 17 00:00:00 2001
From: Tim Sheerman-Chase <t.sheerman-chase@surrey.ac.uk>
Date: Fri, 31 Aug 2012 19:12:57 +0100
Subject: [PATCH] Update doc strings with piecewise affine

---
 skimage/transform/_geometric.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/skimage/transform/_geometric.py b/skimage/transform/_geometric.py
index 8321ba1e..8771542b 100644
--- a/skimage/transform/_geometric.py
+++ b/skimage/transform/_geometric.py
@@ -584,6 +584,10 @@ class PiecewiseAffineTransform(ProjectiveTransform):
 
     """2D piecewise affine transformation.
 
+    Control points are used to define the mapping. The transform is based on
+    a Delaunay triangulation of the points to form a mesh. Each triangle is
+    used to find a local affine transform.
+
     Parameters
     ----------
     TODO