diff --git a/notebooks/julia_async.ipynb b/notebooks/julia_async.ipynb
index b265bbd..d6a579e 100644
--- a/notebooks/julia_async.ipynb
+++ b/notebooks/julia_async.ipynb
@@ -53,7 +53,7 @@
     "end\n",
     "function why_q2()\n",
     "    msg = \"\"\"\n",
-    "    The time in doing the loop will be almost zero since the loop just schedules 10 tasks, which should be very fast.\n",
+    "    The time in doing the loop will be O(1) since the loop just schedules 10 tasks, which should be a (small) constant time independent of n.\n",
     "    \"\"\"\n",
     "    println(msg)\n",
     "end\n",
@@ -758,7 +758,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "t = @elapsed @show compute_π(140_000_000)"
+    "n = 140_000_000\n",
+    "t = @elapsed @show compute_π(n)"
    ]
   },
   {
@@ -773,7 +774,7 @@
     "    a) 10*t\n",
     "    b) t\n",
     "    c) 0.1*t\n",
-    "    d) near 0*t \n"
+    "    d) O(1), i.e. time independent from n \n"
    ]
   },
   {
@@ -783,8 +784,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "n = 140_000_000\n",
     "@time for i in 1:10\n",
-    "    @show compute_π(140_000_000)\n",
+    "    @show compute_π(n)\n",
     "end"
    ]
   },
@@ -810,7 +812,7 @@
     "    a) 10*t\n",
     "    b) t\n",
     "    c) 0.1*t\n",
-    "    d) near 0*t \n",
+    "    d) O(1) \n",
     "\n"
    ]
   },
@@ -821,8 +823,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "n = 140_000_000\n",
     "@time for i in 1:10\n",
-    "    @async @show compute_π(140_000_000)\n",
+    "    @async @show compute_π(n)\n",
     "end"
    ]
   },
@@ -848,7 +851,7 @@
     "    a) 10*t\n",
     "    b) t\n",
     "    c) 0.1*t\n",
-    "    d) near 0*t \n"
+    "    d) O(1) \n"
    ]
   },
   {
@@ -858,8 +861,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "n = 140_000_000\n",
     "@time @sync for i in 1:10\n",
-    "    @async @show compute_π(140_000_000)\n",
+    "    @async @show compute_π(n)\n",
     "end"
    ]
   },
@@ -884,7 +888,7 @@
     "\n",
     "    a) infinity\n",
     "    b) 1 second\n",
-    "    c) near 0 seconds\n",
+    "    c) less than 1 seconds\n",
     "    d) 3 seconds"
    ]
   },
@@ -934,7 +938,7 @@
     "\n",
     "    a) infinity\n",
     "    b) 1 second\n",
-    "    c) near 0 seconds\n",
+    "    c) less than 1 seconds\n",
     "    d) 3 seconds"
    ]
   },