diff --git a/docs/INDEX.md b/docs/INDEX.md
index f42fa94a..d41d61ee 100644
--- a/docs/INDEX.md
+++ b/docs/INDEX.md
@@ -26,7 +26,7 @@
 
 | # | Document | Description |
 |---|----------|-------------|
-| 1 | [Implementation Guide](./implementation-guide-dialogue.en.md) | Learn the 5 backends through dialogue between Senior and Newcomer |
+| 1 | [Implementation Guide](./implementation-guide-dialogue.en.md) | Learn the 6 backends through dialogue between Senior and Newcomer |
 | 2 | [Parser Generator Comparison & @eval Strategy](./parser-generator-comparison-and-eval-strategy.en.md) | unlaxer vs ANTLR/PEG.js/Tree-sitter comparison and @eval annotation design |
 
 ## Analysis