diff --git a/scripts/tools.txt b/scripts/tools.txt
index c679f92..60e9fe0 100644
--- a/scripts/tools.txt
+++ b/scripts/tools.txt
@@ -1,5 +1,6 @@
 klayout
 magic
 netgen
+irsim
 openlane
-qflow
\ No newline at end of file
+qflow