diff --git a/README.org b/README.org
index 7a70a1b6..ba2b020f 100644
--- a/README.org
+++ b/README.org
@@ -105,6 +105,9 @@ repository, at a more recent commit, with the following command:
 guix system image --image-type=iso9660 /path/to/this/channel/nongnu/system/install.scm
 #+end_src
 
+Make sure you have added nonguix as a channel, and run =guix pull= then =hash guix=
+to refresh your terminal environment.
+
 Like the official Guix installation image, this will produce a read-only image
 with any changes made stored in memory.  Alternatively, a writable image can
 be created with the following command: