diff --git a/CHANGELOG.md b/CHANGELOG.md
index 454023f25..6b3334ad1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 -   Added `Application.EVENT_VALIDATE_PROJECT` event for plugins which implement custom validation, #2183.
 -   Plugins may now return an object from external symbol resolvers, #2066.
+-   Expose `Comment.displayPartsToMarkdown` on for themes overwriting the `comment` helper, #2115.
 
 ### Bug Fixes
 
diff --git a/src/lib/models/comments/comment.ts b/src/lib/models/comments/comment.ts
index 37079324c..c39e2f8e4 100644
--- a/src/lib/models/comments/comment.ts
+++ b/src/lib/models/comments/comment.ts
@@ -121,6 +121,65 @@ export class Comment {
         return result;
     }
 
+    /**
+     * Helper function to convert an array of comment display parts into markdown suitable for
+     * passing into Marked. `urlTo` will be used to resolve urls to any reflections linked to with
+     * `@link` tags.
+     */
+    static displayPartsToMarkdown(
+        parts: readonly CommentDisplayPart[],
+        urlTo: (ref: Reflection) => string
+    ) {
+        const result: string[] = [];
+
+        for (const part of parts) {
+            switch (part.kind) {
+                case "text":
+                case "code":
+                    result.push(part.text);
+                    break;
+                case "inline-tag":
+                    switch (part.tag) {
+                        case "@label":
+                        case "@inheritdoc": // Shouldn't happen
+                            break; // Not rendered.
+                        case "@link":
+                        case "@linkcode":
+                        case "@linkplain": {
+                            if (part.target) {
+                                const url =
+                                    typeof part.target === "string"
+                                        ? part.target
+                                        : urlTo(part.target);
+                                const text =
+                                    part.tag === "@linkcode"
+                                        ? `<code>${part.text}</code>`
+                                        : part.text;
+                                result.push(
+                                    url
+                                        ? `<a href="${url}">${text}</a>`
+                                        : part.text
+                                );
+                            } else {
+                                result.push(part.text);
+                            }
+                            break;
+                        }
+                        default:
+                            // Hmm... probably want to be able to render these somehow, so custom inline tags can be given
+                            // special rendering rules. Future capability. For now, just render their text.
+                            result.push(`{${part.tag} ${part.text}}`);
+                            break;
+                    }
+                    break;
+                default:
+                    assertNever(part);
+            }
+        }
+
+        return result.join("");
+    }
+
     /**
      * Helper utility to clone {@link Comment.summary} or {@link CommentTag.content}
      */
diff --git a/src/lib/output/themes/default/DefaultThemeRenderContext.ts b/src/lib/output/themes/default/DefaultThemeRenderContext.ts
index 6c72ccee5..208255a92 100644
--- a/src/lib/output/themes/default/DefaultThemeRenderContext.ts
+++ b/src/lib/output/themes/default/DefaultThemeRenderContext.ts
@@ -1,11 +1,11 @@
 import type { RendererHooks } from "../..";
-import type {
+import {
+    Comment,
     CommentDisplayPart,
     ReferenceType,
     Reflection,
 } from "../../../models";
 import type { NeverIfInternal, Options } from "../../../utils";
-import { displayPartsToMarkdown } from "../lib";
 import type { DefaultTheme } from "./DefaultTheme";
 import { defaultLayout } from "./layouts/default";
 import { index } from "./partials";
@@ -62,14 +62,14 @@ export class DefaultThemeRenderContext {
         return url ? this.theme.markedPlugin.getRelativeUrl(url) : url;
     };
 
-    urlTo = (reflection: Reflection) => this.relativeURL(reflection.url);
+    urlTo = (reflection: Reflection) => this.relativeURL(reflection.url)!;
 
     markdown = (
         md: readonly CommentDisplayPart[] | NeverIfInternal<string | undefined>
     ) => {
         if (md instanceof Array) {
             return this.theme.markedPlugin.parseMarkdown(
-                displayPartsToMarkdown(md, this.urlTo)
+                Comment.displayPartsToMarkdown(md, this.urlTo)
             );
         }
         return md ? this.theme.markedPlugin.parseMarkdown(md) : "";
diff --git a/src/lib/output/themes/lib.tsx b/src/lib/output/themes/lib.tsx
index 3b01121fb..e38397be9 100644
--- a/src/lib/output/themes/lib.tsx
+++ b/src/lib/output/themes/lib.tsx
@@ -1,14 +1,12 @@
 import {
     Comment,
-    CommentDisplayPart,
     DeclarationReflection,
     Reflection,
     ReflectionFlags,
     SignatureReflection,
     TypeParameterReflection,
 } from "../../models";
-import { assertNever, JSX } from "../../utils";
-import type { DefaultThemeRenderContext } from "./default/DefaultThemeRenderContext";
+import { JSX } from "../../utils";
 
 export function stringify(data: unknown) {
     if (typeof data === "bigint") {
@@ -117,50 +115,6 @@ export function camelToTitleCase(text: string) {
     return text.substring(0, 1).toUpperCase() + text.substring(1).replace(/[a-z][A-Z]/g, (x) => `${x[0]} ${x[1]}`);
 }
 
-export function displayPartsToMarkdown(
-    parts: readonly CommentDisplayPart[],
-    urlTo: DefaultThemeRenderContext["urlTo"]
-) {
-    const result: string[] = [];
-
-    for (const part of parts) {
-        switch (part.kind) {
-            case "text":
-            case "code":
-                result.push(part.text);
-                break;
-            case "inline-tag":
-                switch (part.tag) {
-                    case "@label":
-                    case "@inheritdoc": // Shouldn't happen
-                        break; // Not rendered.
-                    case "@link":
-                    case "@linkcode":
-                    case "@linkplain": {
-                        if (part.target) {
-                            const url = typeof part.target === "string" ? part.target : urlTo(part.target);
-                            const text = part.tag === "@linkcode" ? `<code>${part.text}</code>` : part.text;
-                            result.push(url ? `<a href="${url}">${text}</a>` : part.text);
-                        } else {
-                            result.push(part.text);
-                        }
-                        break;
-                    }
-                    default:
-                        // Hmm... probably want to be able to render these somehow, so custom inline tags can be given
-                        // special rendering rules. Future capability. For now, just render their text.
-                        result.push(`{${part.tag} ${part.text}}`);
-                        break;
-                }
-                break;
-            default:
-                assertNever(part);
-        }
-    }
-
-    return result.join("");
-}
-
 /**
  * Renders the reflection name with an additional `?` if optional.
  */