diff --git a/nf_core/pipeline-template/pyproject.toml b/nf_core/pipeline-template/pyproject.toml
index 53cc9af325..1ed87cee5b 100644
--- a/nf_core/pipeline-template/pyproject.toml
+++ b/nf_core/pipeline-template/pyproject.toml
@@ -1,3 +1,5 @@
+# Config file for Python. Mostly used to configure linting of bin/check_samplesheet.py with Black.
+# Should be kept the same as nf-core/tools to avoid fighting with template synchronisation.
 [tool.black]
 line-length = 120
 target_version = ["py37", "py38", "py39", "py310"]