diff --git a/mia_core/utils.py b/mia_core/utils.py
index 662d789..4576b84 100644
--- a/mia_core/utils.py
+++ b/mia_core/utils.py
@@ -166,4 +166,7 @@ class Pagination:
 
 
 class PageNoOutOfRangeError(Exception):
+    """The error thrown when the specified page number is out of
+    range.
+    """
     pass
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