diff --git a/lib/stack b/lib/stack
index 7d98604..f09ddce 100644
--- a/lib/stack
+++ b/lib/stack
@@ -19,6 +19,7 @@
 function stack_install_service {
     local service=$1
     if type install_${service} >/dev/null 2>&1; then
+        # FIXME(dhellmann): Needs to be python3-aware at some point.
         if [[ ${USE_VENV} = True && -n ${PROJECT_VENV[$service]:-} ]]; then
             rm -rf ${PROJECT_VENV[$service]}
             source $TOP_DIR/tools/build_venv.sh ${PROJECT_VENV[$service]} ${ADDITIONAL_VENV_PACKAGES//,/ }