diff --git a/notebooks/challenge/paleo/exercise_3.ipynb b/notebooks/challenge/paleo/exercise_3.ipynb
index 08f91b38..11e3823e 100644
--- a/notebooks/challenge/paleo/exercise_3.ipynb
+++ b/notebooks/challenge/paleo/exercise_3.ipynb
@@ -19,7 +19,7 @@
     "\n",
     "Download (`git clone`) isotope-enabled CESM1.3 (iCESM1.3; [code available here](https://github.com/NCAR/iCESM1.3_iHESP_hires)), as the version of CESM used in this tutorial does not include water isotope capabilities. \n",
     "\n",
-    "Create, configure, build and run a fully coupled preindustrial case called ``b.e13.B1850.f19_g17.piControl.001`` following [CESM naming conventions](https://www.cesm.ucar.edu/models/cesm2/naming-conventions) including water isotope tracers. \n",
+    "Create, configure, build and run a fully coupled preindustrial case called ``b.e13.B1850.f19_g16.piControl.001`` following [CESM naming conventions](https://www.cesm.ucar.edu/models/cesm2/naming-conventions) including water isotope tracers. \n",
     "\n",
     "Run for 1 year. \n",
     "\n",
@@ -40,7 +40,7 @@
     "\n",
     "**What is the resolution for B1850?**\n",
     "\n",
-    "- Use resolution ``f19_g17`` for fast throughput \n",
+    "- Use resolution ``f19_g16`` for fast throughput \n",
     "\n",
     "**Which XML variable should you change to tell the model to run for one year?**\n",
     "\n",