diff --git a/src/schemas/json/rumdl.json b/src/schemas/json/rumdl.json
index dbb83722a25..ab42301eb13 100644
--- a/src/schemas/json/rumdl.json
+++ b/src/schemas/json/rumdl.json
@@ -11,6 +11,8 @@
       "default": {
         "enable": [],
         "disable": [],
+        "extend-enable": [],
+        "extend-disable": [],
         "exclude": [],
         "include": [],
         "respect-gitignore": true,
@@ -81,6 +83,22 @@
           },
           "default": []
         },
+        "extend-enable": {
+          "description": "Additional rules to enable on top of the base set (additive across config levels)",
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "default": []
+        },
+        "extend-disable": {
+          "description": "Additional rules to disable on top of the base set (additive across config levels)",
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "default": []
+        },
         "exclude": {
           "description": "Files to exclude",
           "type": "array",
@@ -155,7 +173,7 @@
       "minimum": 0
     },
     "MarkdownFlavor": {
-      "description": "Markdown flavor/dialect. Accepts: standard, gfm, mkdocs, mdx, quarto, obsidian. Aliases: commonmark/github map to standard, qmd/rmd/rmarkdown map to quarto.",
+      "description": "Markdown flavor/dialect. Accepts: standard, gfm, mkdocs, mdx, quarto, obsidian, kramdown. Aliases: commonmark/github map to standard, qmd/rmd/rmarkdown map to quarto, jekyll maps to kramdown.",
       "type": "string",
       "enum": [
         "standard",
@@ -168,7 +186,9 @@
         "qmd",
         "rmd",
         "rmarkdown",
-        "obsidian"
+        "obsidian",
+        "kramdown",
+        "jekyll"
       ]
     },
     "CodeBlockToolsConfig": {