diff --git a/src/helpers/channels/threads/add_to_thread.ts b/src/helpers/channels/threads/add_to_thread.ts
index a1320611e..2de27e14e 100644
--- a/src/helpers/channels/threads/add_to_thread.ts
+++ b/src/helpers/channels/threads/add_to_thread.ts
@@ -4,9 +4,9 @@ import { Errors } from "../../../types/discordeno/errors.ts";
 import { endpoints } from "../../../util/constants.ts";
 import { requireBotChannelPermissions } from "../../../util/permissions.ts";
 
-/** Adds the bot to a thread. When a user id is provided, it adds that user to the thread. User id requires the ability to send messages in the thread. Both requires the thread is not archived.
+/** Adds a user to a thread. Requires the ability to send messages in the thread. Requires the thread is not archived.
  */
-export async function addToThread(threadId: bigint, userId?: bigint) {
+export async function addToThread(threadId: bigint, userId: bigint) {
   const thread = await cacheHandlers.get("threads", threadId);
   if (thread) {
     if (thread.archived) {
@@ -14,12 +14,10 @@ export async function addToThread(threadId: bigint, userId?: bigint) {
     }
 
     // If a user id is provided SEND_MESSAGES is required.
-    if (userId) {
-      const channel = await cacheHandlers.get("channels", thread.channelId);
-      // TODO: does MANAGE_THREADS override this????
-      if (channel) await requireBotChannelPermissions(channel, ["SEND_MESSAGES"]);
-    }
+    const channel = await cacheHandlers.get("channels", thread.channelId);
+    // TODO: does MANAGE_THREADS override this????
+    if (channel) await requireBotChannelPermissions(channel, ["SEND_MESSAGES"]);
   }
 
-  return await rest.runMethod("put", userId ? endpoints.THREAD_USER(threadId, userId) : endpoints.THREAD_ME(threadId));
+  return await rest.runMethod("put", endpoints.THREAD_USER(threadId, userId));
 }
diff --git a/src/helpers/channels/threads/join_thread.ts b/src/helpers/channels/threads/join_thread.ts
new file mode 100644
index 000000000..c3bf65e24
--- /dev/null
+++ b/src/helpers/channels/threads/join_thread.ts
@@ -0,0 +1,14 @@
+import { cacheHandlers } from "../../../cache.ts";
+import { rest } from "../../../rest/rest.ts";
+import { Errors } from "../../../types/discordeno/errors.ts";
+import { endpoints } from "../../../util/constants.ts";
+
+/** Adds the bot to the thread. Cannot join an archived thread. */
+export async function joinThread(threadId: bigint) {
+  const thread = await cacheHandlers.get("threads", threadId);
+  if (thread?.archived) {
+    throw new Error(Errors.CANNOT_ADD_USER_TO_ARCHIVED_THREADS);
+  }
+
+  return await rest.runMethod("put", endpoints.THREAD_ME(threadId));
+}