Add doc about the $ feature of wipe-domain

diff --git a/docs/markdown/recursor/running.md b/docs/markdown/recursor/running.md
index d7dd8d01945ae3d3e2286ba1b0a452a591e88518..81b0b0094a4299f0dca3084403f180384b6b5f98 100644 (file)
--- a/docs/markdown/recursor/running.md
+++ b/docs/markdown/recursor/running.md
@@ -87,6 +87,8 @@ Available after 3.6.1, report currently running version.
 ### `wipe-cache domain1. [domain2. ..]`
 Wipe entries from the cache. This is useful if, for example, an important server has a new IP address, but the TTL has not yet expired. Multiple domain names can be passed. For versions before 3.1, you must terminate a domain with a `.`! So to wipe powerdns.org, issue `rec_control wipe-cache powerdns.org.`. For later versions, the dot is optional.
 
+To wipe all subdomain entries, append a $ at the end for example `powerdns.com$` would wipe that domain as well as `doc.powerdns.com` etc.
+
 Note that deletion is exact, wiping `com.` will leave `www.powerdns.com.` untouched!
 
 **Warning**: As of 3.1.7, this command also wipes the negative query cache for the specified domain.