diff --git a/README.md b/README.md
index 2817325..b1ba8ca 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,9 @@ Here are the props you can pass to the MystEditor component:
 - `topbar` *(default: true)* - whether to show the topbar
 - `templateList` - path/url to a JSON file containing your document templates. For an example see `public/linkedtemplatelist.json`.
 - `transforms` - [custom transforms](#custom-transforms)
+- `getAvatar` *(default: (login) => `https://secure.gravatar.com/avatar/${login}?s=30&d=identicon`)* - a function that returns the avatar for a given username
+- `getUserUrl` *(default: (login) => `#`)* - a function that returns a url to a web page with a users profile
+  It is used when an avatar is clicked.
 - `collaboration` - options related to live collaboration:
   - `enabled` *(default: false)*
   - `wsUrl` *(example: ws://example:4444)* - url of the websocket server
diff --git a/src/MystEditor.js b/src/MystEditor.js
index 2821631..a51d2d5 100644
--- a/src/MystEditor.js
+++ b/src/MystEditor.js
@@ -135,6 +135,7 @@ const MystEditor = ({
   transforms = [],
   // this will create a bogus random avatar when no specific getAvatar function is provided
   getAvatar = (login) => `https://secure.gravatar.com/avatar/${login}?s=30&d=identicon`,
+  getUserUrl = (login) => "#",
   backslashLineBreak = true,
   parent,
   syncScroll = false,
@@ -147,10 +148,13 @@ const MystEditor = ({
   const text = useText({ initialText, transforms, customRoles, preview, backslashLineBreak, parent });
 
   const [alert, setAlert] = useState(null);
-  const [users, setUsers] = useReducer((_, currentUsers) => currentUsers.map((u) => ({ ...u, avatarUrl: getAvatar(u.login) })), []);
+  const [users, setUsers] = useReducer(
+    (_, currentUsers) => currentUsers.map((u) => ({ ...u, avatarUrl: getAvatar(u.login), userUrl: getUserUrl(u.login) })),
+    [],
+  );
 
   const { provider, undoManager, ytext, ydoc, ready, error } = useCollaboration(collaboration);
-  const ycomments = useComments(ydoc, provider, getAvatar);
+  const ycomments = useComments(ydoc, provider, getAvatar, getUserUrl);
 
   const alertFor = (alertText, secs) => {
     setAlert(alertText);
diff --git a/src/comments/ycomments.js b/src/comments/ycomments.js
index b64eb41..e96d206 100644
--- a/src/comments/ycomments.js
+++ b/src/comments/ycomments.js
@@ -31,12 +31,13 @@ const newRandomCommentId = () => "comment-" + Math.random().toString().replace("
  * into Y.Array are immutable (if they are not Y.js primitives).
  */
 export class CommentLineAuthors {
-  constructor(/** @type {Y.Doc} */ ydoc, provider, getAvatar, commentId) {
+  constructor(/** @type {Y.Doc} */ ydoc, provider, getAvatar, getUserUrl, commentId) {
     this.user = provider.awareness.getLocalState().user;
     /** @type {Y.Array<Y.Map<{name: string, color: string, avatar?: string }>>} */
     this.lineAuthors = ydoc.getArray(commentId + "/commentLineAuthors");
     this.ydoc = ydoc;
     this.getAvatar = getAvatar;
+    this.getUserUrl = getUserUrl;
     this.commentId = commentId;
   }
 
@@ -46,6 +47,7 @@ export class CommentLineAuthors {
     if (!authorData) return;
 
     authorData.avatar = this.getAvatar(authorData.name);
+    authorData.url = this.getUserUrl(authorData.name);
     return authorData;
   }
 
@@ -269,10 +271,11 @@ export class YComments {
    * @param {Y.Doc} ydoc
    * @param {WebsocketProvider} provider
    */
-  constructor(ydoc, provider, getAvatar) {
+  constructor(ydoc, provider, getAvatar, getUserUrl) {
     this.ydoc = ydoc;
     this.provider = provider;
     this.getAvatar = getAvatar;
+    this.getUserUrl = getUserUrl;
 
     /** @type {EditorView} The main codemirror instance */
     this.mainCodeMirror = null;
@@ -304,7 +307,7 @@ export class YComments {
   }
 
   lineAuthors(commentId) {
-    return new CommentLineAuthors(this.ydoc, this.provider, this.getAvatar, commentId);
+    return new CommentLineAuthors(this.ydoc, this.provider, this.getAvatar, this.getUserUrl, commentId);
   }
 
   positions() {
diff --git a/src/components/Avatars.js b/src/components/Avatars.js
index a211315..b73e655 100644
--- a/src/components/Avatars.js
+++ b/src/components/Avatars.js
@@ -34,8 +34,10 @@ const AvatarsWrapper = styled.div`
   }
 `;
 
-export const Avatar = ({ login, color, avatarUrl }) =>
-  html` <img src=${avatarUrl} key=${login} title=${login} class="avatar" style="border-color: ${color}" />`;
+export const Avatar = ({ login, color, avatarUrl, userUrl }) =>
+  html`<a href=${userUrl || "#"} target="_blank"
+    ><img src=${avatarUrl} key=${login} title=${login} class="avatar" style="border-color: ${color}"
+  /></a>`;
 
 const AvatarPlaceholder = ({ n, usernames }) =>
   html` <${AvatarsWrapper} title=${usernames}>
diff --git a/src/components/ResolvedComment.js b/src/components/ResolvedComment.js
index 7220c9f..6265e72 100644
--- a/src/components/ResolvedComment.js
+++ b/src/components/ResolvedComment.js
@@ -258,7 +258,7 @@ const ResolvedComment = ({ c, authors, ycomments, content }) => {
       <${CommentContainer} className="resolved-comment" color=${authors.get(1).color}>
         <${CommentTopbar}>
           <${FlexRow}>
-            <${Avatar} login=${authors.get(1).name} color=${authors.get(1).color} avatarUrl=${authors.get(1).avatar} />
+            <${Avatar} login=${authors.get(1).name} color=${authors.get(1).color} avatarUrl=${authors.get(1).avatar} userUrl=${authors.get(1).url} />
             <${CommentAuthor}>${authors.get(1).name}<//>
           <//>
           <${FlexRow}>
diff --git a/src/hooks/useComments.js b/src/hooks/useComments.js
index deffe2f..e47c38d 100644
--- a/src/hooks/useComments.js
+++ b/src/hooks/useComments.js
@@ -1,10 +1,10 @@
 import { useMemo } from "preact/hooks";
 import { YComments } from "../comments/ycomments";
 
-export default function useComments(ydoc, provider, getAvatar) {
+export default function useComments(ydoc, provider, getAvatar, getUserUrl) {
   if (!ydoc || !provider) return null;
   return useMemo(() => {
-    const ycomments = new YComments(ydoc, provider, getAvatar);
+    const ycomments = new YComments(ydoc, provider, getAvatar, getUserUrl);
     window.myst_editor.ycomments = ycomments;
     return ycomments;
   }, []);