diff --git a/librecursebuster/main_test.go b/librecursebuster/main_test.go
index 5971231..c804a28 100644
--- a/librecursebuster/main_test.go
+++ b/librecursebuster/main_test.go
@@ -241,6 +241,26 @@ func TestCookies(t *testing.T) {
 		panic("Failed Cookie test")
 	}
 }
+func TestExt(t *testing.T) {
+	finished := make(chan struct{})
+	cfg := getDefaultConfig()
+	cfg.Extensions = "csv,exe,aspx"
+	urlSlice := preSetupTest(cfg, "2010", finished, t)
+	found := postSetupTest(urlSlice)
+	gState.Wait()
+
+	if x, ok := found["/a.exe"]; !ok || !x {
+		panic("Failed Ext test1")
+	}
+
+	if x, ok := found["/a.aspx"]; !ok || !x {
+		panic("Failed Ext test2")
+	}
+
+	if x, ok := found["/a.csv"]; !ok || !x {
+		panic("Failed Ext test3")
+	}
+}
 
 func postSetupTest(urlSlice []string) (found map[string]bool) {
 	//start up the management goroutines
diff --git a/librecursebuster/testserver/main.go b/librecursebuster/testserver/main.go
index 99d3271..d1ab40b 100644
--- a/librecursebuster/testserver/main.go
+++ b/librecursebuster/testserver/main.go
@@ -72,6 +72,12 @@ func handler(w http.ResponseWriter, r *http.Request) {
 		fallthrough
 	case "/a":
 		fallthrough
+	case "/a.exe":
+		fallthrough
+	case "/a.csv":
+		fallthrough
+	case "/a.aspx":
+		fallthrough
 	case "/a/":
 		fallthrough
 	case "/a/b":
diff --git a/main.go b/main.go
index 11be136..1226fa6 100644
--- a/main.go
+++ b/main.go
@@ -44,9 +44,9 @@ func main() {
 	flag.StringVar(&globalState.Cfg.Canary, "canary", "", "Custom value to use to check for wildcards")                                               //todo: add test
 	flag.BoolVar(&globalState.Cfg.CleanOutput, "clean", false, "Output clean URLs to the output file for easy loading into other tools and whatnot.") //todo: add test
 	flag.StringVar(&globalState.Cfg.Cookies, "cookies", "", "Any cookies to include with requests. This is smashed into the cookies header, so copy straight from burp I guess? (-cookies 'cookie1=cookie1content; cookie2=1; cookie3=cookie3lol?!?;'.")
-	flag.BoolVar(&globalState.Cfg.Debug, "debug", false, "Enable debugging")
+	flag.BoolVar(&globalState.Cfg.Debug, "debug", false, "Enable debugging") //todo: add test
 	//flag.IntVar(&globalState.Cfg.MaxDirs, "dirs", 1, "Maximum directories to perform busting on concurrently forcing limit to 1 because it's complicated otherwise
-	flag.StringVar(&globalState.Cfg.Extensions, "ext", "", "Extensions to append to checks. Multiple extensions can be specified, comma separate them.")
+	flag.StringVar(&globalState.Cfg.Extensions, "ext", "", "Extensions to append to checks. Multiple extensions can be specified, comma separate them. (-ext 'csv,exe,aspx')")
 	flag.Var(&globalState.Cfg.Headers, "headers", "Additional headers to include with request. Supply as key:value. Can specify multiple - eg '-headers X-Forwarded-For:127.0.01 -headers X-ATT-DeviceId:XXXXX'")
 	flag.BoolVar(&globalState.Cfg.HTTPS, "https", false, "Use HTTPS instead of HTTP.")
 	flag.StringVar(&globalState.Cfg.InputList, "iL", "", "File to use as an input list of URL's to start from")