diff --git a/proxy.ini b/proxy.ini
index 57586a8..f835555 100644
--- a/proxy.ini
+++ b/proxy.ini
@@ -4,6 +4,8 @@
 # for libraries to self-select whether they can handle a request, which opens
 # up additional possibilities
 
+# Example of match based on an HTTP header. The key is space-delimited:
+# <http header key>: <header match prefix> <path match prefix>
+Host: iam / = zig-out/lib/libfaas-proxy-sample-lib.so
 /c = zig-out/lib/libfaas-proxy-sample-lib-in-c.so
 / = zig-out/lib/libfaas-proxy-sample-lib.so
-Host: iam.aws.lerch.org / = zig-out/lib/libfaas-proxy-sample-lib.so