diff --git a/.gitignore b/.gitignore
index 74231d1ff..a2eb222c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@
 node_modules/
 dist/
 .env
-.DS_Store
\ No newline at end of file
+.DS_Store
+.tool-versions
diff --git a/fern/assistants/dynamic-variables.mdx b/fern/assistants/dynamic-variables.mdx
index 29606af9e..6ca1103cc 100644
--- a/fern/assistants/dynamic-variables.mdx
+++ b/fern/assistants/dynamic-variables.mdx
@@ -79,6 +79,8 @@ These variables are automatically filled based on the current (UTC) time, so you
 | `{{year}}`              | Current year (UTC)                | 2024                      |
 | `{{customer.number}}`   | Customer's phone number           | +1xxxxxxxxxx              |
 | `{{customer.X}}`        | Any other customer property       |                           |
+| `{{transport.conversationType}}`   | Whether the conversation is over `chat` or `voice`           | `chat`              |
+| `{{transport.X}}`        | Any other transport-related property       |                           |
 
 ## Advanced date and time usage
 
@@ -116,13 +118,13 @@ Outputs: `Monday, January 01, 2024, 03:45 PM`
 | `%H:%M`        | 15:45         | 24-hour time        |
 | `%A`           | Monday        | Day of week         |
 | `%b %d, %Y`    | Jan 01, 2024  | Abbrev. Month Day   |
-```
+
 
 ## Using dynamic variables in the dashboard
 
 To use dynamic variables in the dashboard, include them in your prompts or messages using double curly braces. For example:
 
-```
+```liquid
 Hello, {{name}}!
 ```
 
@@ -131,4 +133,22 @@ When you start a call, you must provide a value for each variable (like `name`)
 <Note>
 Always use double curly braces (`{{variableName}}`) to reference dynamic variables in your prompts and messages.
 </Note>
-</rewritten_file>
\ No newline at end of file
+
+## Setting assistant prompt using conversation type
+
+Using the `transport.conversationType` variable in your assistant's system prompt, you can modify how it behaves in chats or calls:
+
+```liquid
+[Identity]
+You are a helpful assistant, talking with a customer via {{transport.conversationType}}.
+
+[Response Guidelines]
+{% if transport.conversationType == "chat" -%}
+- Format numbers naturally; eg, a US phone number could be +1 (555) 123-4567
+- Use Markdown formatting for lists (both unordered and ordered)
+{%- elsif transport.conversationType == "voice" -%}
+- Always spell numbers in words; eg, 256 should be 'two hundred and fifty six'
+- Only ask one question at a time
+- Never use Markdown format; write everything as if it is being said aloud
+{%- endif -%}
+```
\ No newline at end of file