diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index 3b128bc54..eb5e3d4ce 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -1,6 +1,10 @@
 name: pre-commit
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   pre-commit:
diff --git a/DIRECTORY.md b/DIRECTORY.md
index 2e9c03cbc..c8f03658c 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -444,6 +444,7 @@
   * [Scoring Functions](machine_learning/scoring_functions.py)
   * [Sequential Minimum Optimization](machine_learning/sequential_minimum_optimization.py)
   * [Similarity Search](machine_learning/similarity_search.py)
+  * [Support Vector Machines](machine_learning/support_vector_machines.py)
   * [Word Frequency Functions](machine_learning/word_frequency_functions.py)
 
 ## Maths
diff --git a/project_euler/problem_101/sol1.py b/project_euler/problem_101/sol1.py
index 27438e086..d5c503af7 100644
--- a/project_euler/problem_101/sol1.py
+++ b/project_euler/problem_101/sol1.py
@@ -44,9 +44,8 @@ Find the sum of FITs for the BOPs.
 from __future__ import annotations
 
 from collections.abc import Callable
-from typing import Union
 
-Matrix = list[list[Union[float, int]]]
+Matrix = list[list[float | int]]
 
 
 def solve(matrix: Matrix, vector: Matrix) -> Matrix: