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+## Add ;/& terminators (and other syntax) on the line with the <<, not here.
+
+### Problematic code:
+
+```sh
+sudo bash -s << "END"
+  cmd1
+  cmd2
+END &
+
+```
+
+### Correct code:
+
+```sh
+sudo bash -s << "END" &
+  cmd1
+  cmd2
+END
+```
+### Rationale:
+
+You are using `&`, `;`, `&>` or similar after a here document. This is not allowed.
+
+This should instead be part of the line that initiated the here document, i.e. the one with the `<<`. 
+
+If it helps, look at `<< "END"` as if it was `< file`, and make sure the resulting command is valid. This is what the shell does. You can then append here document data after the command.
+
+### Exceptions:
+
+None.
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