diff --git a/ccp4/README.md b/ccp4/README.md
index 7baa009..a7ca21a 100644
--- a/ccp4/README.md
+++ b/ccp4/README.md
@@ -31,9 +31,9 @@ EOF
 Then:
 
 ```bash
-module use unstable && module load modbuild/2.1.2
+module use unstable && module load modbuild/2.1.3
 cd ccp4
-modbuild build --check-mode 9.0     # yamllint the config first
+modbuild build --prep 9.0   # download/cache only; also verifies tmp_dir took effect
 modbuild build 9.0
 ```