diff --git a/ruff.schema.json b/ruff.schema.json
index f1e425ea270fb7..00ce4201818d4d 100644
--- a/ruff.schema.json
+++ b/ruff.schema.json
@@ -66,16 +66,6 @@
         "type": "string"
       }
     },
-    "extend-ignore": {
-      "description": "A list of rule codes or prefixes to ignore, in addition to those specified by `ignore`.\n\nThis option has been DEPRECATED in favor of `ignore` since its usage is now interchangeable with `ignore`.",
-      "type": [
-        "array",
-        "null"
-      ],
-      "items": {
-        "$ref": "#/definitions/RuleSelector"
-      }
-    },
     "extend-select": {
       "description": "A list of rule codes or prefixes to enable, in addition to those specified by `select`.",
       "type": [
diff --git a/ruff_cli/src/args.rs b/ruff_cli/src/args.rs
index c87b9b8f9568e7..39aad884e57127 100644
--- a/ruff_cli/src/args.rs
+++ b/ruff_cli/src/args.rs
@@ -117,8 +117,7 @@ pub struct CheckArgs {
         help_heading = "Rule selection"
     )]
     pub extend_select: Option<Vec<RuleSelector>>,
-    /// Like --ignore, but adds additional rule codes on top of the ignored
-    /// ones.
+    /// Like --ignore. (Deprecated: You can just use --ignore instead.)
     #[arg(
         long,
         value_delimiter = ',',
diff --git a/src/settings/options.rs b/src/settings/options.rs
index 18162ec043caf0..4ad8025a542b28 100644
--- a/src/settings/options.rs
+++ b/src/settings/options.rs
@@ -147,6 +147,7 @@ pub struct Options {
     ///
     /// This option has been DEPRECATED in favor of `ignore`
     /// since its usage is now interchangeable with `ignore`.
+    #[schemars(skip)]
     pub extend_ignore: Option<Vec<RuleSelector>>,
     #[option(
         default = "[]",