diff --git a/.cspell.json b/.cspell.json
index 2da0ce6..3ebf9b7 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -69,8 +69,10 @@
     "Wix",
     "Xero",
     "frontmatter",
+    "logomark",
     "reauth",
     "reauthorize",
+    "Supabase",
     "uvx",
     "webhook"
   ]
diff --git a/features/chat.mdx b/features/chat.mdx
index fd0b8d4..b7d819b 100644
--- a/features/chat.mdx
+++ b/features/chat.mdx
@@ -18,6 +18,16 @@ Ask it to summarise your unread emails and create tasks from the actionable ones
 
 Describe the outcome. Get the outcome. Review.
 
+## Model mode
+
+Use the model mode dropdown in the chat composer to choose **High** or **Fast** for the current chat.
+
+High uses full reasoning for harder work. Fast turns reasoning off for quick, lighter requests where speed matters more than depth. It can respond sooner and use fewer tokens.
+
+The mode is chat-specific. You can change it between messages, and new chats start in High mode unless you switch them.
+
+This only affects the chat you are using in the app. Telegram has its own conversation mode: using `/fast` in Telegram does not change an app chat, and changing the app dropdown does not change Telegram.
+
 ## Asking for things well
 
 Two things matter more than anything else.
diff --git a/remote/telegram.mdx b/remote/telegram.mdx
index 08a7d1b..01a8415 100644
--- a/remote/telegram.mdx
+++ b/remote/telegram.mdx
@@ -59,6 +59,16 @@ If you ask for something that needs an app you have not connected yet, the bot w
 
 Before Fluso sends anything for you (an email, a Slack message, a new issue), it shows you the draft and waits for your yes. Nothing goes out without your approval.
 
+## Fast mode
+
+Send `/fast` to switch the current Telegram conversation to Fast mode. Fast mode turns reasoning off for quick, lighter work and can use fewer tokens.
+
+Send `/fast` again in the same Telegram conversation to switch back to High mode. The bot sends a short confirmation each time, so you can see whether Fast mode is on or off.
+
+This is conversation-specific, not an account setting. `/newchat` starts a fresh Telegram conversation back in High mode.
+
+Telegram mode and app mode are separate. Using `/fast` in Telegram does not change any chat in the app, and changing the app's High/Fast dropdown does not change Telegram.
+
 ## Files, images, voice
 
 You can send more than just text:
@@ -76,6 +86,7 @@ Very large files may not go through. If a file is rejected, send a smaller versi
 | Command | What it does |
 |---|---|
 | `/newchat` | Start a fresh conversation. Your files are kept. |
+| `/fast` | Toggle the current conversation between Fast and High. `/newchat` resets it to High. |
 | `/reset` | Wipes everything: files, chat history, and what Fluso has learned. Cannot be undone. |
 | `/abort` | Stop what Fluso is doing right now. |
 | `/schedules` | Show anything Fluso has scheduled, if any. |