diff --git a/.Rbuildignore b/.Rbuildignore
new file mode 100644
index 0000000..5163d0b
--- /dev/null
+++ b/.Rbuildignore
@@ -0,0 +1 @@
+^LICENSE\.md$
diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 0000000..285e365
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,21 @@
+# MIT License
+
+Copyright (c) 2021 moreThanANOVA authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/ui.R b/ui.R
index b10c630..9e257e4 100644
--- a/ui.R
+++ b/ui.R
@@ -92,10 +92,11 @@ ui <- fluidPage(
       sidebarLayout(
         sidebarPanel(
           img(src = "table_str.png", width = "100%"),
-          selectInput('selected_language',
-                      i18n$t("Switch language/切换语言"),
-                      choices = i18n$get_languages(),
-                      selected = i18n$get_key_translation()),
+          selectInput("selected_language",
+            i18n$t("Switch language/切换语言"),
+            choices = i18n$get_languages(),
+            selected = i18n$get_key_translation()
+          ),
           h4(i18n$t("Data Source")),
           radioButtons(
             "data_source",
@@ -337,4 +338,4 @@ ui <- fluidPage(
       includeMarkdown("resource/page/acknowledgements.md")
     )
   )
-)
+)
\ No newline at end of file