diff --git a/altamisa/isatab/modify_investigation.py b/altamisa/isatab/modify_investigation.py
index b893d81..5abf572 100644
--- a/altamisa/isatab/modify_investigation.py
+++ b/altamisa/isatab/modify_investigation.py
@@ -72,8 +72,6 @@ def add_assay(self, input_path: str) -> models.InvestigationInfo:
         assays = self.investigation.studies[0].assays
         assays += investigation2.studies[0].assays
 
-        new_study = attr.evolve(
-            self.investigation.studies[0], protocols=protocols, assays=assays
-        )
+        new_study = attr.evolve(self.investigation.studies[0], protocols=protocols, assays=assays)
         modified_inv = attr.evolve(self.investigation, studies=(new_study,))
         return modified_inv