diff --git a/talks/virtual_intro/intro.ipynb b/talks/virtual_intro/intro.ipynb
index 39d00b15f300c35f212c4a43c5a70577c1752953..b64e05951b474f579b4e8ed714d6f406970d45bb 100644
--- a/talks/virtual_intro/intro.ipynb
+++ b/talks/virtual_intro/intro.ipynb
@@ -123,10 +123,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "a = [1, 2, 3, 4, 5]\n",
+    "mylist = [1, 2, 3, 4, 5]\n",
     "\n",
-    "for elem in a:\n",
-    "    print(elem)"
+    "for element in mylist:\n",
+    "    print(element)"
    ]
   },
   {
@@ -428,8 +428,7 @@
    "outputs": [],
    "source": [
     "a = [10, 20, 30]\n",
-    "a = a + [70]\n",
-    "a += [80]\n",
+    "a[2] = 999\n",
     "print(a)"
    ]
   },
diff --git a/talks/virtual_intro/intro.md b/talks/virtual_intro/intro.md
index 5bfcae06e5b033c61c684b8339807337c58bd274..8d5499a21cfb5659697feb0e8d138818bacf3fa8 100644
--- a/talks/virtual_intro/intro.md
+++ b/talks/virtual_intro/intro.md
@@ -320,8 +320,7 @@ The key difference between lists and tuples is that tuples are *immutable*
 
 ```
 a = [10, 20, 30]
-a = a + [70]
-a += [80]
+a[2] = 999
 print(a)
 ```