diff --git a/.vitepress/theme/useTerminal.ts b/.vitepress/theme/useTerminal.ts
index 0cfc845..ab873c7 100644
--- a/.vitepress/theme/useTerminal.ts
+++ b/.vitepress/theme/useTerminal.ts
@@ -32,6 +32,11 @@ export default function useTerminal(inputEl: HTMLTextAreaElement, commands: Simp
     inputEl.setSelectionRange(pos, pos)
   }
 
+  function cursorTouchesPrompt() {
+    const promptEnd = inputEl.value.lastIndexOf(prompt) + prompt.length
+    return inputEl.selectionStart === promptEnd
+  }
+
   function setFocus() {
     inputEl.focus()
   }
@@ -189,6 +194,15 @@ export default function useTerminal(inputEl: HTMLTextAreaElement, commands: Simp
       case 'Backspace':
         if (cursorAtPrompt()) ev.preventDefault()
         break
+      case 'ArrowUp':
+        // TODO: commandHistory(-1)
+        ev.preventDefault()
+        break
+      case 'ArrowLeft':
+        if (cursorTouchesPrompt()) ev.preventDefault()
+        break
+      default:
+        console.debug('key pressed:', ev.key, ev.keyCode)
     }
   }