diff --git a/tutorial/lessons/18-session-management.md b/tutorial/lessons/18-session-management.md
index 2fbe640..2ebcc4a 100644
--- a/tutorial/lessons/18-session-management.md
+++ b/tutorial/lessons/18-session-management.md
@@ -47,6 +47,20 @@ This shows request counts, token usage, and other session metrics.
 
 ---
 
+### Quick ephemeral questions
+
+**`/ask`** — Ask a one-off question without affecting your conversation history:
+
+```
+/ask What's the difference between Promise.all and Promise.allSettled?
+```
+
+This is useful when you need a quick lookup mid-task — checking syntax, verifying a concept, or confirming a command — without cluttering your main conversation context. The response appears immediately, but neither your question nor the answer enters the session history. Your next message continues from where you were before `/ask`.
+
+Think of it as a side channel for throwaway questions that would otherwise pollute your working context.
+
+---
+
 ### Running shell commands with `!`
 
 You can run a shell command directly from within your Copilot session using the `!` prefix:
@@ -108,8 +122,9 @@ Sometimes it's better to start over than to correct course:
 1. `--continue` resumes the most recent session; `/resume` lets you pick from all past sessions
 2. Session IDs let you target a specific session — useful when you have several active workstreams
 3. `/usage` gives you raw session stats — a quick health check before diving in
-4. `/restart` reloads the CLI without clearing your conversation — useful when the CLI feels buggy or after changing config
-5. This is about building habits: use `/clear` between tasks, `/restart` when the CLI misbehaves, and `/resume` to pick up where you left off
+4. `/ask` is perfect for quick throwaway questions — checking syntax or concepts without polluting your working context
+5. `/restart` reloads the CLI without clearing your conversation — useful when the CLI feels buggy or after changing config
+6. This is about building habits: use `/clear` between tasks, `/restart` when the CLI misbehaves, and `/resume` to pick up where you left off
 
 ---