diff --git a/utils.py b/utils.py
index da4dfcbe40c9bfc7bf447ab25d50102d13fb62d1..85e2deacbb6b90849aeb3b35cfa835060438790a 100644
--- a/utils.py
+++ b/utils.py
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 from sklearn.neighbors import KDTree
 from sklearn.manifold import TSNE
 from sklearn.decomposition import PCA, TruncatedSVD