diff --git a/README.adoc b/README.adoc
index 10b18cd..23e45ab 100644
--- a/README.adoc
+++ b/README.adoc
@@ -130,7 +130,8 @@ example, that would be http://localhost:8080[]:
  $ ../xP 127.0.0.1:8080 127.0.0.1:9000
 
 For remote use, it's recommended to put 'xP' behind a reverse proxy, with TLS,
-and some form of HTTP authentication.
+and some form of HTTP authentication.  Pass the external URL of the WebSocket
+endpoint as the third command line argument in this case.
 
 Client Certificates
 -------------------
diff --git a/xC-gen-proto.awk b/xC-gen-proto.awk
index de8e9b8..ad375af 100644
--- a/xC-gen-proto.awk
+++ b/xC-gen-proto.awk
@@ -9,7 +9,7 @@
 # Native types: bool, u{8,16,32,64}, i{8,16,32,64}, string
 #
 # Don't define any new types, unless you hate yourself, then it's okay to do so.
-# Both backends are a pain in the arse, for different reasons.
+# Backends tend to be a pain in the arse, for different reasons.
 #
 # All numbers are encoded in big-endian byte order.
 # Booleans are one byte each.
@@ -18,11 +18,11 @@
 # Enumeration values automatically start at 1, and are encoded as i8.
 # Any struct or union field may be a variable-length array.
 #
-# Message framing is done externally, but also happens to prefix u32 lengths.
+# Message framing is done externally, but also happens to prefix u32 lengths,
+# unless this role is already filled by, e.g., WebSocket.
 #
-# Usage: env LC_ALL=C awk -v prefix=Relay \
-#  -f xC-gen-proto.awk        < xC-proto \
-#  -f xC-gen-proto-{c,go}.awk > xC-proto.{c,go} | {clang-format,gofmt}
+# Usage: env LC_ALL=C awk -f xC-gen-proto.awk -f xC-gen-proto-{c,go,js}.awk \
+#  xC-proto > xC-proto.{c,go,js} | {clang-format,gofmt,...}
 
 # --- Utilities ----------------------------------------------------------------