diff --git a/src/converter.ts b/src/converter.ts
index b008d99..94597f1 100644
--- a/src/converter.ts
+++ b/src/converter.ts
@@ -121,6 +121,7 @@ export class Converter {
     this.convertConstToEnum();
     this.convertNullableTypeArray();
     this.removeUnsupportedSchemaKeywords();
+    this.renameSchema$comment();
     return this.openapi30;
   }
 
@@ -169,23 +170,15 @@ export class Converter {
    * Replace all `$comment` with `x-comment`
    */
   convertJsonSchemaComments() {
-    const schemaVisitor: SchemaVisitor = (schema: SchemaObject): SchemaObject => {
-      for (const key in schema) {
-        const subSchema = schema[key];
-        if (subSchema !== null && typeof subSchema === 'object') {
-          if (key === '$comment') {
-            const comment = schema['$comment'];
-            if (comment.length > 0) {
-              delete schema['$comment'];
-              schema['x-comment'] = comment;
-              this.log(`Replaces $comment with x-comment. Comment:\n${comment}`);
-            }
-          } else {
-            schema[key] = walkObject(subSchema, schemaVisitor);
-          }
-        }
+    const schemaVisitor:  SchemaVisitor =
+    (schema: SchemaObject): SchemaObject =>
+    {
+      if (schema.hasOwnProperty('$comment')) {
+        schema['x-comment'] = schema['$comment'];
+        delete schema['$comment'];
+        this.log(`schema $comment renamed to x-comment`);
       }
-      return schema;
+      return this.walkNestedSchemaObjects(schema, schemaVisitor);
     };
     visitSchemaObjects(this.openapi30, schemaVisitor);
   }
@@ -252,6 +245,21 @@ export class Converter {
     visitSchemaObjects(this.openapi30, schemaVisitor);
   }
 
+  renameSchema$comment() {
+    const schemaVisitor:  SchemaVisitor =
+    (schema: SchemaObject): SchemaObject =>
+    {
+      if (schema.hasOwnProperty('$comment')) {
+        schema['x-comment'] = schema['$comment'];
+        delete schema['$comment'];
+        this.log(`schema $comment renamed to x-comment`);
+      }
+      return this.walkNestedSchemaObjects(schema, schemaVisitor);
+    };
+    visitSchemaObjects(this.openapi30, schemaVisitor);
+  }
+
+
   private json(x) {
     return JSON.stringify(x, null, 2);
   }
diff --git a/test/converter.spec.ts b/test/converter.spec.ts
index 6789df3..0946d08 100644
--- a/test/converter.spec.ts
+++ b/test/converter.spec.ts
@@ -355,6 +355,90 @@ describe('resolver test suite', () => {
     done();
   });
 
+   test('Remove $id and $schema keywords', (done) => {
+     // const sourceFileName = path.join(__dirname, 'data/root.yaml'); // __dirname is the test dir
+     const input = {
+       openapi: '3.1.0',
+       components: {
+         schemas: {
+           a: {
+             $id: 'http://www.example.com/schemas/a',
+             $schema: 'https://json-schema.org/draft/2020-12/schema',
+             type: 'string',
+           },
+         },
+       },
+     };
+     const expected = {
+       openapi: '3.0.3',
+       components: {
+         schemas: {
+           a: {
+             type: 'string',
+           },
+         },
+       },
+     };
+     const converter = new Converter(input, { verbose: true });
+     const converted: any = converter.convert();
+     expect(converted).toEqual(expected);
+     done();
+   });
+
+   test('Rename $comment to x-comment', (done) => {
+     const input = {
+       openapi: '3.1.0',
+       components: {
+         schemas: {
+           a: {
+             type: 'object',
+             $comment: 'a comment on schema a',
+             properties: {
+               b: {
+                 type: 'object',
+                 $comment: 'A comment on a.b',
+                 properties: {
+                   s: {
+                     type: 'string',
+                     $comment: 'A comment on a.b.s',
+                   },
+                 },
+               },
+             },
+           },
+         },
+       },
+     };
+     const expected = {
+       openapi: '3.0.3',
+       components: {
+         schemas: {
+           a: {
+             type: 'object',
+             'x-comment': 'a comment on schema a',
+             properties: {
+               b: {
+                 type: 'object',
+
+                 'x-comment': 'A comment on a.b',
+                 properties: {
+                   s: {
+                     type: 'string',
+                     'x-comment': 'A comment on a.b.s',
+                   },
+                 },
+               },
+             },
+           },
+         },
+       },
+     };
+     const converter = new Converter(input, { verbose: true });
+     const converted: any = converter.convert();
+     expect(converted).toEqual(expected);
+     done();
+   });
+
   test('Convert nullable type array', (done) => {
     // const sourceFileName = path.join(__dirname, 'data/root.yaml'); // __dirname is the test dir
     const input = {
diff --git a/test/data/openapi.yaml b/test/data/openapi.yaml
index 44771fb..913a772 100644
--- a/test/data/openapi.yaml
+++ b/test/data/openapi.yaml
@@ -427,3 +427,12 @@ components:
       format: date-time
       readOnly: true
       example: '2021-10-30T19:06:04.250Z'
+
+    resourceTitle:
+      title: Resource Title
+      description: A Title for a business object
+      type: string
+      maxLength: 80
+      x-comment: >-
+        this maxLength must match the maxLength of
+        `title` in the `resourcePatch` schema.