diff --git a/src/utils/boxprint.py b/src/utils/boxprint.py
index 9f37426e..e6eae1e3 100644
--- a/src/utils/boxprint.py
+++ b/src/utils/boxprint.py
@@ -1,8 +1,16 @@
-def bordered(text):
+"""Add box around string.
+
+taken from https://stackoverflow.com/a/20757491 under https://creativecommons.org/licenses/by-sa/4.0/
+https://stackoverflow.com/users/816449/bunyk
+"""
+
+
+def bordered(text: str) -> str:
+    """Add border to string."""
     lines = text.splitlines()
     width = max(len(s) for s in lines)
     res = ['┌' + '─' * width + '┐']
     for s in lines:
         res.append('│' + (s + ' ' * width)[:width] + '│')
     res.append('└' + '─' * width + '┘')
-    return '\n'.join(res)
\ No newline at end of file
+    return '\n'.join(res)