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+## No comments allowed after here-doc token. Comment the next line instead.
+
+### Problematic code:
+
+```sh
+cat << eof  # --- Start greeting --
+Hello
+eof         # --- End greeting ---
+```
+
+### Correct code:
+
+```sh
+cat << eof  # --- Start greeting --
+Hello
+eof
+            # --- End greeting ---
+```
+### Rationale:
+
+The terminator token for a here document must be on an entirely separate line. No comments are allowed after it.
+
+Move the comment somewhere else, such as the next line.
+
+### Exceptions:
+
+None
\ No newline at end of file