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+An unknown meta item was used.
+
+Erroneous code example:
+
+```compile_fail,E0541
+#[deprecated(
+    since="1.0.0",
+    // error: unknown meta item
+    reason="Example invalid meta item. Should be 'note'")
+]
+fn deprecated_function() {}
+```
+
+Meta items are the key-value pairs inside of an attribute. The keys provided
+must be one of the valid keys for the specified attribute.
+
+To fix the problem, either remove the unknown meta item, or rename it if you
+provided the wrong name.
+
+In the erroneous code example above, the wrong name was provided, so changing
+to a correct one it will fix the error. Example:
+
+```
+#[deprecated(
+    since="1.0.0",
+    note="This is a valid meta item for the deprecated attribute."
+)]
+fn deprecated_function() {}
+```