diff --git a/README.md b/README.md
index 7294959..48df5e4 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,15 @@ $ xcaddy build \
     --with github.com/caddyserver/ntlm-transport@v0.1.1=../../my-fork
 ```
 
+You can even replace Caddy core using the `--with` flag:
+
+```
+$ xcaddy build \
+    --with github.com/caddyserver/caddy/v2=../../my-caddy-fork
+```
+
+This allows you to hack on Caddy core (and optionally plug in extra modules at the same time!) with relative ease.
+
 ### For plugin development
 
 If you run `xcaddy` from within the folder of the Caddy plugin you're working on _without the `build` subcommand_, it will build Caddy with your current module and run it, as if you manually plugged it in and invoked `go run`.
diff --git a/cmd/xcaddy/main.go b/cmd/xcaddy/main.go
index acf4658..bc0fe58 100644
--- a/cmd/xcaddy/main.go
+++ b/cmd/xcaddy/main.go
@@ -141,7 +141,7 @@ func getCaddyOutputFile() string {
 	if runtime.GOOS == "windows" {
 		return "caddy.exe"
 	}
-	return "caddy"
+	return "." + string(filepath.Separator) + "caddy"
 }
 
 func runDev(ctx context.Context, args []string) error {