Update proxying.md

Author: hemang-snyk

docs/mcp-scan/proxying.md

@@ -21,7 +21,7 @@ The `mcp-scan proxy` command temporarily intercepts the MCP traffic on your mach
 To get started, run the following command in your terminal:
 
 ```
-uvx mcp-scan@latest proxy
+uvx --with "mcp-scan[proxy]" mcp-scan@latest proxy
 ```
 
 As visible from the output, this temporarily rewrites all MCP server configurations across your machine, to route calls via [Gateway](../guardrails/gateway.md), allowing you to inspect and guardrail MCP calls.
@@ -84,4 +84,4 @@ mcp-scan proxy path/to/client/json
 
 # use single-line trace logging format
 mcp-scan proxy --pretty oneline 
-```
+```