diff --git a/seminar.md b/seminar.md
index 55a38ce2d1c773132ef5711f7219b7eed47d3901..9794dde509f683f33a76d7a138d46f7a86b8650c 100644
--- a/seminar.md
+++ b/seminar.md
@@ -37,7 +37,7 @@ and a mattermost channel for chat. To join the mattermost channel:
 |2021-02-01| Takuto Asakura | Towards Grounding of Formulae ([slides](https://drive.google.com/file/d/1JxNKW5M0KKYeBeL6Umsg6ZKBNzdCV_DC/view)) |
 |2021-02-15| ? | ? |
 |2021-03-01| Bernhard Schröder | Something about proof structures? |
-|2021-03-15| ? | ? |
+|2021-03-15| Peter Köpke | Isabelle-Naproche |
 |2021-03-29| ? | ? |