diff --git a/README.md b/README.md
index f91f55a..080fc14 100644
--- a/README.md
+++ b/README.md
@@ -6,14 +6,14 @@ Queries the mDNS record for a given .local address, and maps it to the given sub
 
 ### CLI Args
 
-`local-etc-hosts-updater <local_domain> <ip_version> <interface>`
+`local-etc-hosts-updater <local_domain> <ip_version> <scope_id>`
 
 - `local_domain` is the local domain to be queried
 - `ip_version` is an enum.
   - 4 will query for an IPv4 address in the `192.168.0.0/16` subnet
   - 6 will query for a ULA IPv6 address in the `fd00::/8` subnet
   - 0 will do both
-- `interface` is the interface name to query, it is required for ipv6
+- `scope_id` is the interface numeric interface index as returned by `if_nametoindex`. Largely just to get around limitations on an unrooted android.
 
 ### ENV vars