diff --git a/.changeset/document-cdp-env-var.md b/.changeset/document-cdp-env-var.md
new file mode 100644
index 000000000..55ba7dc54
--- /dev/null
+++ b/.changeset/document-cdp-env-var.md
@@ -0,0 +1,5 @@
+---
+"@anthropic-ai/agent-browser-cli": patch
+---
+
+docs: add AGENT_BROWSER_CDP to --help environment variables list
diff --git a/cli/src/output.rs b/cli/src/output.rs
index d49aa9723..78f5586c9 100644
--- a/cli/src/output.rs
+++ b/cli/src/output.rs
@@ -2864,6 +2864,7 @@ Environment:
   AGENT_BROWSER_DEBUG            Debug output
   AGENT_BROWSER_IGNORE_HTTPS_ERRORS Ignore HTTPS certificate errors
   AGENT_BROWSER_PROVIDER         Browser provider (ios, browserbase, kernel, browseruse, browserless)
+  AGENT_BROWSER_CDP              Connect to Chrome via remote debugging port (e.g. 9222)
   AGENT_BROWSER_AUTO_CONNECT     Auto-discover and connect to running Chrome
   AGENT_BROWSER_ALLOW_FILE_ACCESS Allow file:// URLs to access local files
   AGENT_BROWSER_COLOR_SCHEME     Color scheme preference (dark, light, no-preference)