@@ -2944,20 +2944,22 @@ variants are supported:
29442944`markdown_phpextra` (PHP Markdown Extra)
29452945: `footnotes`, `pipe_tables`, `raw_html`, `markdown_attribute`,
29462946 `fenced_code_blocks`, `definition_lists`, `intraword_underscores`,
2947− `header_attributes`, `abbreviations`.
2947+ `header_attributes`, `abbreviations`, `shortcut_reference_links`.
29482948
29492949`markdown_github` (GitHub-flavored Markdown)
29502950: `pipe_tables`, `raw_html`, `tex_math_single_backslash`,
29512951 `fenced_code_blocks`, `auto_identifiers`,
29522952 `ascii_identifiers`, `backtick_code_blocks`, `autolink_bare_uris`,
2953− `intraword_underscores`, `strikeout`, `hard_line_breaks`
2953+ `intraword_underscores`, `strikeout`, `hard_line_breaks`,
2954+ `shortcut_reference_links`.
29542955
29552956`markdown_mmd` (MultiMarkdown)
29562957: `pipe_tables` `raw_html`, `markdown_attribute`, `link_attributes`,
29572958 `raw_tex`, `tex_math_double_backslash`, `intraword_underscores`,
29582959 `mmd_title_block`, `footnotes`, `definition_lists`,
29592960 `all_symbols_escapable`, `implicit_header_references`,
2960− `auto_identifiers`, `mmd_header_identifiers`
2961+ `auto_identifiers`, `mmd_header_identifiers`,
2962+ `shortcut_reference_links`.
29612963
29622964`markdown_strict` (Markdown.pl)
29632965: `raw_html`