diff --git a/README.md b/README.md
index 357e219f..c93962b0 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ Choose any of the following input readers:
 - pdfminer.six `invoice2data --input-reader pdfminer invoice.pdf`
 - pdfplumber `invoice2data --input-reader pdfplumber invoice.pdf`
 - ocrmypdf `invoice2data --input-reader ocrmypdf invoice.pdf`
-- gvision `invoice2data --input-reader gvision invoice.pdf` (needs `GOOGLE_APPLICATION_CREDENTIALS` env var)
+- gvision `invoice2data --input-reader gvision invoice.pdf` (needs `GOOGLE_APPLICATION_CREDENTIALS` env var and a Google Cloud Bucket name. The bucket name can be set as an argument to the function ``to_text`` or as an Environment variable named ``GOOGLE_CLOUD_BUCKET_NAME`` )
 
 Choose any of the following output formats: