diff --git a/src/cli.ts b/src/cli.ts
index d2d034b..7d9a2b4 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -148,6 +148,7 @@ program
 program
   .command("review")
   .argument("<branch>", "branch name")
+  .argument("[prompt]", "additional instructions to append to the review prompt")
   .option("-p, --print", "print the review to stdout instead of launching interactive mode")
   .description("Launch an interactive grumpy code review for a branch")
   .action(reviewAction)
diff --git a/src/commands/review.ts b/src/commands/review.ts
index df9e860..ab69979 100644
--- a/src/commands/review.ts
+++ b/src/commands/review.ts
@@ -2,13 +2,14 @@ import * as vm from "../vm.ts"
 import { spinner } from "../spinner.ts"
 import { requireSession, saveChanges } from "./helpers.ts"
 
-export async function action(branch: string, opts: { print?: boolean }) {
+export async function action(branch: string, extra: string | undefined, opts: { print?: boolean }) {
   const { session } = await requireSession(branch)
 
   const spin = spinner("Starting container", branch)
   await vm.ensure((msg) => { spin.text = msg })
 
-  const prompt = "You're a grumpy old senior software engineer. Take a look at the diff between this branch and main, then let me know your thoughts. My co-worker made these changes."
+  let prompt = "You're a grumpy old senior software engineer. Take a look at the diff between this branch and main, then let me know your thoughts. My co-worker made these changes."
+  if (extra) prompt += "\n\n" + extra
 
   if (opts.print) {
     spin.text = "Running review…"