diff --git a/README.rst b/README.rst
index 19ef3c129..d4e1eb156 100644
--- a/README.rst
+++ b/README.rst
@@ -993,6 +993,10 @@ You can import sops as a module and use it in your python program.
 	tree = sops.walk_and_decrypt(tree, sops_key)
 	sops.write_file(tree, path=path, filetype=pathtype)
 
+Note: this uses the previous implemenation of `sops` written in python, 
+and so doesn't support newer features such as GCP-KMS. 
+To use the current version, call out to `sops` using `subprocess.getoutput`
+
 Showing diffs in cleartext in git
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