diff --git a/src/compiler/objectConstructors.ts b/src/compiler/objectConstructors.ts
index 4e78bd788fd..c1a2a1654c0 100644
--- a/src/compiler/objectConstructors.ts
+++ b/src/compiler/objectConstructors.ts
@@ -42,6 +42,7 @@ import {
     UnionOrIntersectionType,
     UnionType,
 } from "./_namespaces/ts";
+import { SignatureObjectInternals } from "./signatureObjectInternals";
 import { SymbolObjectInternals } from "./symbolObjectInternals";
 
 /** @internal */
@@ -316,11 +317,11 @@ export class SignatureObject implements Signature {
     }
 
     getDocumentationComment(): SymbolDisplayPart[] {
-        throw new TypeError("Not implemented");
+        return SignatureObjectInternals.internals.getDocumentationComment(this);
     }
 
     getJsDocTags(): JSDocTagInfo[] {
-        throw new TypeError("Not implemented");
+        return SignatureObjectInternals.internals.getJsDocTags(this);
     }
 }
 
diff --git a/src/compiler/signatureObjectInternals.ts b/src/compiler/signatureObjectInternals.ts
new file mode 100644
index 00000000000..296305e73e8
--- /dev/null
+++ b/src/compiler/signatureObjectInternals.ts
@@ -0,0 +1,16 @@
+import { JSDocTagInfo, Signature, SymbolDisplayPart } from "./types";
+
+/** @internal */
+export class SignatureObjectInternals {
+    static internals = new SignatureObjectInternals();
+
+    getDocumentationComment(signature: Signature): SymbolDisplayPart[];
+    getDocumentationComment(_signature: Signature): SymbolDisplayPart[] {
+        throw new TypeError("Not implemented.");
+    }
+    
+    getJsDocTags(signature: Signature): JSDocTagInfo[];
+    getJsDocTags(_signature: Signature): JSDocTagInfo[] {
+        throw new TypeError("Not implemented.");
+    }
+}
diff --git a/src/services/services.ts b/src/services/services.ts
index ba5a3b8d773..b6e643d4476 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -2,6 +2,7 @@ import {
     SignatureObject,
     SymbolObject,
 } from "../compiler/objectConstructors";
+import { SignatureObjectInternals } from "../compiler/signatureObjectInternals";
 import { SymbolObjectInternals } from "../compiler/symbolObjectInternals";
 import {
     __String,
@@ -374,15 +375,20 @@ function ensureSignatureExtraFields(signature: Signature) {
     return extra;
 }
 
-SignatureObject.prototype.getDocumentationComment = function (this: Signature): SymbolDisplayPart[] {
-    const extra = ensureSignatureExtraFields(this);
-    return extra.documentationComment ??= getDocumentationComment(singleElementArray(this.declaration), this.checker);
-};
+class ServicesSignatureObjectInternals extends SignatureObjectInternals {
+    override getDocumentationComment(signature: Signature): SymbolDisplayPart[] {
+        const extra = ensureSignatureExtraFields(signature);
+        return extra.documentationComment ??= getDocumentationComment(singleElementArray(signature.declaration), signature.checker);
+    }
 
-SignatureObject.prototype.getJsDocTags = function (this: Signature): JSDocTagInfo[] {
-    const extra = ensureSignatureExtraFields(this);
-    return extra.jsDocTags ??= getJsDocTagsOfDeclarations(singleElementArray(this.declaration), this.checker);
-};
+    override getJsDocTags(signature: Signature): JSDocTagInfo[] {
+        const extra = ensureSignatureExtraFields(signature);
+        return extra.jsDocTags ??= getJsDocTagsOfDeclarations(singleElementArray(signature.declaration), signature.checker);
+    }
+}
+
+// Override the internals for signatures
+SignatureObjectInternals.internals = new ServicesSignatureObjectInternals();
 
 /**
  * Returns whether or not the given node has a JSDoc "inheritDoc" tag on it.