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+##  Include a shebang (#!) to specify the shell.
+
+### Problematic code:
+
+    echo "Hello World"
+
+### Correct code:
+
+    #!/bin/sh
+    echo "Hello World"
+
+### Rationale:
+
+ShellCheck noticed that your file does not start with a shebang. Shebangs are good for a number of reasons:
+
+* They allow scripts to be executed outside of interactive prompts.
+* They ensure the script is executed by the correct shell.
+* Editors and utilities (including shellcheck) use it to determine the file type.
+
+### Contraindications
+
+For checking snippets, use `shellcheck -e 2148`. This is the default for [shellcheck.net](http://www.shellcheck.net).
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