diff --git a/ipynb/Countdown.ipynb b/ipynb/Countdown.ipynb
index eb25d2a..92710f3 100644
--- a/ipynb/Countdown.ipynb
+++ b/ipynb/Countdown.ipynb
@@ -78,7 +78,7 @@
     "\n",
     "- *Given any sequence of numbers, place operations and brackets to form a dict of `{value: expression}` for every value that can be made.*\n",
     "\n",
-    "I'll define  `expressions(numbers)` to return an **expression table**: a dict of `{value: expression}` for all expressions (strings) whose numeric value is a `value` that can be made using all the `numbers`, for example:\n",
+    "I'll define  `expressions(numbers)` to return an **expression table**: a dict of `{value: expression}` for all expressions (strings) whose numeric value is a `value` that can be made using all the `numbers` in left-to-right order. For example:\n",
     "\n",
     "    expressions((3, 2))    = {1: '(3-2)', 1.5: '(3/2)', 5: '(3+2)', 6: '(3*2)'}\n",
     "\n",