diff --git a/bin/repl b/bin/repl
index 647f574..7a15277 100755
--- a/bin/repl
+++ b/bin/repl
@@ -169,7 +169,8 @@ function showWelcome() {
   console.log(`${colors.bright}${colors.cyan}═══════════════════════════════════════════════════════════════${colors.reset}`)
   console.log(`${colors.bright}🪸 ReefVM REPL${colors.reset}`)
   console.log(`${colors.bright}${colors.cyan}═══════════════════════════════════════════════════════════════${colors.reset}`)
-  console.log(`\nType instructions one at a time. Commands:`)
+  console.log(`\nType instructions one at a time. Use ${colors.bright}Tab${colors.reset} for autocomplete.`)
+  console.log(`\nCommands:`)
   console.log(`  ${colors.bright}clear${colors.reset}  - Clear screen and reset state`)
   console.log(`  ${colors.bright}reset${colors.reset}  - Reset VM state (keep history visible)`)
   console.log(`  ${colors.bright}exit${colors.reset}   - Quit REPL`)
@@ -182,10 +183,24 @@ function showWelcome() {
 }
 
 async function repl() {
+  // Get all opcode names for autocomplete
+  const opcodes = Object.keys(OpCode)
+    .filter(key => isNaN(Number(key))) // Filter out numeric keys (enum values)
+
+  const commands = ['clear', 'reset', 'exit', 'quit']
+  const completions = [...opcodes, ...commands]
+
+  // Autocomplete function
+  function completer(line: string) {
+    const hits = completions.filter(c => c.toLowerCase().startsWith(line.toLowerCase()))
+    return [hits.length ? hits : completions, line]
+  }
+
   const rl = readline.createInterface({
     input: process.stdin,
     output: process.stdout,
     prompt: `${colors.green}reef>${colors.reset} `,
+    completer,
   })
 
   let instructions: string[] = []