add container names

README.md

@@ -64,9 +64,11 @@ For the last one the scanner asks the Docker Engine API on the Unix socket for
 `/containers/json` and scans each `Image` reference, de-duplicated and in
 listing order. Stopped containers are not included. The scanner's own container
 image is skipped so a scheduled run does not report on itself; set
-`INCLUDE_SELF=true` to include it. Scan log lines name the running container(s)
+`INCLUDE_SELF=true` to include it. Scan log lines and Apprise notifications name the running container(s)
 that use each image, for example
-`Scanning nginx:1.27 (used by container web)`.
+`Scanning nginx:1.27 (used by container web)` and
+`Vulnerability scan: nginx:1.27 [container: web]`. Explicitly passed images
+omit the container context.
 
 The socket is looked up in this order: