diff --git a/tests/FILEFORMAT.md b/tests/FILEFORMAT.md
index 72bdb747a9..d99c66c0d1 100644
--- a/tests/FILEFORMAT.md
+++ b/tests/FILEFORMAT.md
@@ -438,6 +438,7 @@ Features testable here are:
 
 - `--libcurl`
 - `alt-svc`
+- `aws` - built with **aws-sigv4** support
 - `AppleIDN`
 - `asyn-rr` - c-ares is used for additional records only
 - `bearssl`