diff --git a/.github/workflows/ci-black-formatting.yaml b/.github/workflows/ci-black-formatting.yaml
index 90a0b95431..bbe9b37c26 100644
--- a/.github/workflows/ci-black-formatting.yaml
+++ b/.github/workflows/ci-black-formatting.yaml
@@ -33,6 +33,8 @@ jobs:
         id: syntax-errors
         run: |
           ERROR=0
+          # Using 2 Python versions - one minimum required for IfcOpenShell
+          # and other that's used by Blender currently.
           python3.10 -W error -m compileall -q src/ifcopenshell-python || ERROR=1
           python3.11 -W error -m compileall -q src/bonsai || ERROR=1
           exit $ERROR