diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 14519a61..2e2f5fce 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -3274,6 +3274,7 @@ Shell:
   color: "#89e051"
   aliases:
   - sh
+  - shell-script
   - bash
   - zsh
   extensions:
@@ -3284,6 +3285,7 @@ Shell:
   - .command
   - .fcgi
   - .ksh
+  - .sh.in
   - .tmux
   - .tool
   - .zsh