diff --git a/README.md b/README.md
index b1f3097b4..9d4f3edf8 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ Honestly... I don't know. I could be writing code that may be suddenly obsolete.
  - [x] Rectangle
  - [x] Size
  - [x] Point
+ - [x] Sphere
 - Resampling algorithms. (Performance improvements?)
  - [x] Box
  - [x] Bicubic