diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index baaf064b..5961407d 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -107,3 +107,4 @@
   Polygon, circle and ellipse drawing functions
   Adaptive thresholding
   Implementation of Matlab's `regionprops`
+  Estimation of geometric transformation parameters