minor comments

1 files changed, 2 insertions, 2 deletions

diff --git a/bsfs/graph/walk.py b/bsfs/graph/walk.py
index 63ef5e9..1b1cfa0 100644
--- a/bsfs/graph/walk.py
+++ b/bsfs/graph/walk.py
@@ -88,9 +88,9 @@ class Walk(abc.Hashable, abc.Callable): # type: ignore [misc] # invalid base cla
             if pred.uri.get('fragment', None) == name
             )
         if len(predicates) == 0: # no fragment found for name
-            raise ValueError(f'no available predicate matches {name}')
+            raise ValueError(f'no available predicate matches {name}') # FIXME: Custom exception
         if len(predicates) > 1: # ambiguous name
-            raise ValueError(f'{name} matches multiple predicates')
+            raise ValueError(f'{name} matches multiple predicates') # FIXME: Custom exception
         # append predicate to walk
         return predicates # type: ignore [return-value] # size is one