diff --git a/artiq-fast/windows/make_conda_packages.sh b/artiq-fast/windows/make_conda_packages.sh
index 4cf32d8..8d1d3e2 100755
--- a/artiq-fast/windows/make_conda_packages.sh
+++ b/artiq-fast/windows/make_conda_packages.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# run manually to build the list of conda dependencies to install in the
+# test environments.
+
 set -e
 
 nix-build -E "