diff --git a/sample/trick2018/05-tompng/remarks.markdown b/sample/trick2018/05-tompng/remarks.markdown
index 17be56b61f..b4e5708a43 100644
--- a/sample/trick2018/05-tompng/remarks.markdown
+++ b/sample/trick2018/05-tompng/remarks.markdown
@@ -28,4 +28,4 @@ gen3d 'ochoko.stl' do
   l----www----------www----l
 end
 ```
-`+` and `-` are the same meaning(just for apperance)
+`+` and `-` are the same meaning(just for appearance)