diff --git a/index.md b/index.md
index 23fc9c438e45e245926bb771d2dbe09ec2d67283..5ef61ad9d7e29d5c5a235155503a26ce9dd88b50 100644
--- a/index.md
+++ b/index.md
@@ -155,6 +155,8 @@ Chaîne *BBB* du cours <https://bbb.hesge.ch/rooms/ty7-tww-afq-lql/join>
 
 ## Travail pratique: planètes, [HTML](https://malaspinas.academy/phys/planets/enonce.html), [PDF](https://malaspinas.academy/phys/planets/enonce.pdf), [skeleton.tar](https://malaspinas.academy/phys/planets/skeleton.tar)
 
+## Travail pratique: lignes de champs, [HTML](https://malaspinas.academy/phys/field_lines/enonce.html), [PDF](https://malaspinas.academy/phys/field_lines/enonce.pdf), [utils.tar.gz](https://malaspinas.academy/phys/field_lines/utils.tar.gz)
+
 <!-- ## Travail pratique: circuit RC, [HTML](https://malaspinas.academy/phys/rc_circuit/enonce.html), [PDF](https://malaspinas.academy/phys/rc_circuit/enonce.pdf) -->