diff --git a/CLAUDE.md b/CLAUDE.md
index bb2844a3..82250953 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -41,7 +41,7 @@ Must inherit from `ChallengeBase` and follow Black formatting (line length 100).
 #### `__init__`
 ```python
 super().__init__(
-    name="Challenge Display Name",
+    name="Challenge Display Name",  # Used to generate URLs — use URL-friendly characters only (no parentheses, special symbols, etc.)
     atol=1e-05,           # Absolute tolerance (float32 default)
     rtol=1e-05,           # Relative tolerance (float32 default)
     num_gpus=1,
diff --git a/challenges/medium/75_sparse_matrix_dense_matrix_multiplication/challenge.py b/challenges/medium/75_sparse_matrix_dense_matrix_multiplication/challenge.py
index e3660751..3ced7c77 100644
--- a/challenges/medium/75_sparse_matrix_dense_matrix_multiplication/challenge.py
+++ b/challenges/medium/75_sparse_matrix_dense_matrix_multiplication/challenge.py
@@ -8,7 +8,7 @@
 class Challenge(ChallengeBase):
     def __init__(self):
         super().__init__(
-            name="Sparse Matrix-Dense Matrix Multiplication (SpMM)",
+            name="Sparse Matrix-Dense Matrix Multiplication",
             atol=1e-03,
             rtol=1e-03,
             num_gpus=1,