diff --git a/ipynb/TruncatablePrimes.ipynb b/ipynb/TruncatablePrimes.ipynb
index d631c79..37ed75b 100644
--- a/ipynb/TruncatablePrimes.ipynb
+++ b/ipynb/TruncatablePrimes.ipynb
@@ -13,7 +13,7 @@
     "\n",
     "[![](https://community.wolfram.com//c/portal/getImageAttachment?filename=IMG_20181212_120939.jpg&userId=143131)](https://community.wolfram.com/groups/-/m/t/1569707)\n",
     "\n",
-    "The 24-digit number printed on it is a prime, and as you sharpen the pencil and remove digits one at a time from the left, the resulting numbers are all primes:\n",
+    "The 24-digit number printed on this pencil is a prime, and as you sharpen the pencil and remove digits one at a time from the left, the resulting numbers are all primes:\n",
     "\n",
     "    357686312646216567629137 is prime\n",
     "     57686312646216567629137 is prime\n",