1 files changed, 7 insertions, 1 deletions
diff --git a/README.md b/README.md
index 2a1a54d..78e4e40 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Cache S3
 
-File cache backend using S3 protocol (e.g. Minio)
+File cache backend using S3 protocol (e.g. Minio, AWS S3).
 
 ## Installation
 
@@ -14,6 +14,12 @@ The following options are required:
 TTRSS_CACHE_S3_ENDPOINT=http://example.com:9000
 TTRSS_CACHE_S3_BUCKET=bucket-name
 TTRSS_CACHE_S3_REGION=us-east-1
+```
+
+The following options are required if you're directly providing access keys (i.e. not using an IAM role or alternative approach).
+See [Credentials for the AWS SDK for PHP Version 3](https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_credentials.html) for more information.
+
+```ini
 TTRSS_CACHE_S3_ACCESS_KEY=xxx
 TTRSS_CACHE_S3_SECRET_KEY=yyy
 ```