diff --git a/README.md b/README.md
index ac729a9c0bd6d0c9b782d3ffacc37c5ffecba3c2..503e1d2fd816ab975790f5cb9f6c4537cf9e3f5d 100644
--- a/README.md
+++ b/README.md
@@ -33,12 +33,12 @@ The above configuration example assumes:
 
 `ID=ivo://<authority>/<resource-key>?<relative-pathname>#extnum`
 
-Note that the service apends '**soda**' to ACCESS_CONTEXT_ROOT.
-
+The service decodes IVOID part after question mark '?'.
 The pathname in the ID is relative to the path in compose.yaml volume-mapping (e.g. '/srv/ska/surveys').
 
 The FITS extension number `#extnum` is optional. Default is the primary HDU.
 
+Note that the service appends '**soda**' to ACCESS_CONTEXT_ROOT.
 Data access example:
 ```bash
 curl -s -k --get