diff --git a/_example/hello-cjk-cyrillic/main.go b/_tools/cjk-cyrillic/main.go
similarity index 100%
rename from _example/hello-cjk-cyrillic/main.go
rename to _tools/cjk-cyrillic/main.go
diff --git a/_tools/erasing.go b/_tools/erasing.go
deleted file mode 100644
index 9e7ee3b..0000000
--- a/_tools/erasing.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package main
-
-import "github.com/c-bata/go-prompt"
-
-func main() {
-	l := 20
-	out := prompt.NewStandardOutputWriter()
-	out.EraseScreen()
-	for i := 0; i < l; i++ {
-		out.CursorGoTo(i, 0)
-		out.WriteStr("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
-	}
-
-	out.CursorGoTo(5, 10)
-	out.EraseLine()
-
-	out.CursorGoTo(l, 0)
-	out.Flush()
-	return
-}
diff --git a/_tools/window_size.go b/_tools/sigwinch/main.go
similarity index 100%
rename from _tools/window_size.go
rename to _tools/sigwinch/main.go
diff --git a/_tools/vt100_debug.go b/_tools/vt100_debug/main.go
similarity index 100%
rename from _tools/vt100_debug.go
rename to _tools/vt100_debug/main.go