diff --git a/tesk/app.py b/tesk/app.py
index f09e525..1dd4883 100644
--- a/tesk/app.py
+++ b/tesk/app.py
@@ -38,6 +38,7 @@ def init_app() -> FlaskApp:
 
     foca = Foca(
         config_file=config_path,
+        custom_config_model="tesk.custom_config.CustomConfig",
     )
     return foca.create_app()
 
diff --git a/tesk/custom_config.py b/tesk/custom_config.py
new file mode 100644
index 0000000..ae1cbaf
--- /dev/null
+++ b/tesk/custom_config.py
@@ -0,0 +1,12 @@
+"""Custom configuration model for the FOCA app."""
+
+from pydantic import BaseModel
+
+from tesk.api.ga4gh.tes.models import Service
+
+
+class CustomConfig(BaseModel):
+    """Custom configuration model for the FOCA app."""
+
+    # Define custom configuration fields here
+    service_info: Service