diff --git a/README b/README
index 2fce0dcec..7f6feaf6f 100644
--- a/README
+++ b/README
@@ -3385,7 +3385,7 @@ variants are supported:
     `shortcut_reference_links`.
 
 `markdown_mmd` (MultiMarkdown)
-:   `pipe_tables` `raw_html`, `markdown_attribute`, `mmd_link_attributes`,
+:   `pipe_tables`, `raw_html`, `markdown_attribute`, `mmd_link_attributes`,
     `raw_tex`, `tex_math_double_backslash`, `intraword_underscores`,
     `mmd_title_block`, `footnotes`, `definition_lists`,
     `all_symbols_escapable`, `implicit_header_references`,