diff --git a/backend/categorisation/handler/Dockerfile b/backend/categorisation/handler/Dockerfile
index 751d42d5..0a92eaba 100644
--- a/backend/categorisation/handler/Dockerfile
+++ b/backend/categorisation/handler/Dockerfile
@@ -29,6 +29,7 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code
 # -----------------------------
 COPY utils/ utils/
+# NOTE: if build is ever slow we can be more specific with which files are copied
 COPY backend/ backend/
 COPY datatypes/ datatypes/