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-rw-r--r--book/src/guides/adding_languages.md37
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diff --git a/book/src/guides/adding_languages.md b/book/src/guides/adding_languages.md
index 9ad2c285..5844a48e 100644
--- a/book/src/guides/adding_languages.md
+++ b/book/src/guides/adding_languages.md
@@ -27,22 +27,32 @@ directory](../configuration.md).
These are the available keys and descriptions for the file.
-| Key | Description |
-| ---- | ----------- |
-| name | The name of the language |
-| scope | A string like `source.js` that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually `source.<name>` or `text.<name>` in case of markup languages |
-| injection-regex | regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential [language injection][treesitter-language-injection] site. |
-| file-types | The filetypes of the language, for example `["yml", "yaml"]` |
-| shebangs | The interpreters from the shebang line, for example `["sh", "bash"]` |
-| roots | A set of marker files to look for when trying to find the workspace root. For example `Cargo.lock`, `yarn.lock` |
-| auto-format | Whether to autoformat this language when saving |
-| comment-token | The token to use as a comment-token |
-| indent | The indent to use. Has sub keys `tab-width` and `unit` |
-| config | Language server configuration |
+| Key | Description |
+| ---- | ----------- |
+| name | The name of the language |
+| scope | A string like `source.js` that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually `source.<name>` or `text.<name>` in case of markup languages |
+| injection-regex | regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential [language injection][treesitter-language-injection] site. |
+| file-types | The filetypes of the language, for example `["yml", "yaml"]` |
+| shebangs | The interpreters from the shebang line, for example `["sh", "bash"]` |
+| roots | A set of marker files to look for when trying to find the workspace root. For example `Cargo.lock`, `yarn.lock` |
+| auto-format | Whether to autoformat this language when saving |
+| diagnostic-severity | Minimal severity of diagnostic for it to be displayed. (Allowed values: `Error`, `Warning`, `Info`, `Hint`) |
+| comment-token | The token to use as a comment-token |
+| indent | The indent to use. Has sub keys `tab-width` and `unit` |
+| config | Language server configuration |
## Queries
-For a language to have syntax-highlighting and indentation among other things, you have to add queries. Add a directory for your language with the path `runtime/queries/<name>/`. The tree-sitter [website](https://tree-sitter.github.io/tree-sitter/syntax-highlighting#queries) gives more info on how to write queries.
+For a language to have syntax-highlighting and indentation among
+other things, you have to add queries. Add a directory for your
+language with the path `runtime/queries/<name>/`. The tree-sitter
+[website](https://tree-sitter.github.io/tree-sitter/syntax-highlighting#queries)
+gives more info on how to write queries.
+
+> NOTE: When evaluating queries, the first matching query takes
+precedence, which is different from other editors like neovim where
+the last matching query supercedes the ones before it. See
+[this issue][neovim-query-precedence] for an example.
## Common Issues
@@ -58,3 +68,4 @@ For a language to have syntax-highlighting and indentation among other things, y
[treesitter-language-injection]: https://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection
[languages.toml]: https://github.com/helix-editor/helix/blob/master/languages.toml
+[neovim-query-precedence]: https://github.com/helix-editor/helix/pull/1170#issuecomment-997294090