more rules

README.md

@@ -16,6 +16,16 @@ This is a non-exhaustive list of linters:
 * A comment for an object must be 64+ characters
 * A comment may only include printable ASCII characters
 * A comment must be a valid Markdown text
+* The compexity of an object must be within acceptable limits
+* The number of void attributes in an object must be smaller than five
+* A program must have mandatory metas: `package`, `architect`, `version`, etc.
+* A test object must have the `@` attribute
+* The `$.` prefix must be used only to avoid ambiguity
+* The `^.` prefix must be used only to avoid ambiguity
+* The `+rt` meta may be present only if the program has at least one atom
+* Some metas must be unique, like `version`, `package`, and `home`
+* The width of any line in a comment must be less than 100
+* An object referenced must either be local or in the `org.eolang` package
 
 [xmir]: https://news.eolang.org/2022-11-25-xmir-guide.html
 [eo]: https://www.eolang.org