diff --git a/README.md b/README.md
index 1e3cb67..2878d86 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,7 @@ Un *repository* di grafiche e infografiche realizzate con il pacchetto *tikzdraw
 | Rolling circle squares itself | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/rolling_circle.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/rolling_circle.pdf) |
 | The Witch of Agnesi | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/agnesi_witch.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/agnesi_witch.pdf) |
 | The Butterfly curve | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/butterfly.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/butterfly.pdf) |
+| Ostomachion | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/ostomachion.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/ostomachion.pdf) |
 
 ### Math without words