[docgen] Update docs

skip-checks: true

1 files changed, 2 insertions, 0 deletions

diff --git a/doc/conform.txt b/doc/conform.txt
index 4cabd0e..c12fb96 100644
--- a/doc/conform.txt
+++ b/doc/conform.txt
@@ -172,6 +172,8 @@ FORMATTERS                                                    *conform-formatter
            in Rust
 `astyle` - A Free, Fast, and Small Automatic Formatter for C, C++, C++/CLI,
          Objective-C, C#, and Java Source Code.
+`auto_optional` - Adds the Optional type-hint to arguments where the default
+                value is None.
 `autoflake` - Removes unused imports and unused variables as reported by
             pyflakes.
 `autopep8` - A tool that automatically formats Python code to conform to the PEP