diff --git a/workflows/go_workflow.py b/workflows/go_workflow.py
index e4e7666..c108eda 100644
--- a/workflows/go_workflow.py
+++ b/workflows/go_workflow.py
@@ -103,6 +103,7 @@ class TestDataFunction(Function):
 
 
 class CelFileImportFunction(Function):
+    """Loads AffyMetrix .CEL-files into matrix."""
     def __init__(self):
         Function.__init__(self, 'cel_import', 'Import Affy')