diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index bff86ccc..72880521 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -28,7 +28,7 @@
   Code to generate skimage logo.
 
 - Zachary Pincus
-  Tracing of low cost paths, FreeImage I/O plugin
+  Tracing of low cost paths, FreeImage I/O plugin, iso-contours
 
 - Almar Klein
   Binary heap class for graph algorithms