diff --git a/src/domain/session/room/timeline/MessageBody.js b/src/domain/session/room/timeline/MessageBody.js
index a2250dfb..42f3c951 100644
--- a/src/domain/session/room/timeline/MessageBody.js
+++ b/src/domain/session/room/timeline/MessageBody.js
@@ -1,5 +1,10 @@
 import { linkify } from "./linkify/linkify.js";
 
+/**
+ * Parse text into parts such as newline, links and text.
+ * @param {string} body A string to parse into parts
+ * @returns {MessageBody} Parsed result
+ */
 export function parsePlainBody(body) {
     const parts = [];
     const lines = body.split("\n");
@@ -16,7 +21,7 @@ export function parsePlainBody(body) {
     for (let i = 0; i < lines.length; i += 1) {
         const line = lines[i];
         if (line.length) {
-            linkify(lines[i], linkifyCallback);
+            linkify(line, linkifyCallback);
         }
         const isLastLine = i >= (lines.length - 1);
         if (!isLastLine) {
diff --git a/src/domain/session/room/timeline/linkify/linkify.js b/src/domain/session/room/timeline/linkify/linkify.js
index 333705c1..58641055 100644
--- a/src/domain/session/room/timeline/linkify/linkify.js
+++ b/src/domain/session/room/timeline/linkify/linkify.js
@@ -1,5 +1,13 @@
 import { regex } from "./regex.js";
 
+/**
+ * Splits text into links and non-links.
+ * For each such separated token, callback is called
+ * with the token and a boolean passed as argument.
+ * The boolean indicates whether the token is a link or not.
+ * @param {string} text Text to split
+ * @param {function(string, boolean)} callback A function to call with split tokens
+ */
 export function linkify(text, callback) {
     const matches = text.matchAll(regex);
     let curr = 0;
diff --git a/src/platform/web/ui/session/room/timeline/TextMessageView.js b/src/platform/web/ui/session/room/timeline/TextMessageView.js
index 4af5e5a2..dc5550ee 100644
--- a/src/platform/web/ui/session/room/timeline/TextMessageView.js
+++ b/src/platform/web/ui/session/room/timeline/TextMessageView.js
@@ -28,6 +28,9 @@ export class TextMessageView extends TemplateView {
     }
 }
 
+/**
+ * Map from part to function that outputs DOM for the part
+ */
 const formatFunction = {
     text: textPart => text(textPart.text),
     link: linkPart => tag.a({ href: linkPart.url, target: "_blank", rel: "noopener" }, [linkPart.text]),