diff --git a/notebooks/Kbmod_Reference.ipynb b/notebooks/Kbmod_Reference.ipynb
index 628fe0f1..3edf933e 100644
--- a/notebooks/Kbmod_Reference.ipynb
+++ b/notebooks/Kbmod_Reference.ipynb
@@ -204,7 +204,7 @@
    "source": [
     "print(f\"Width = {im.get_width()}\")\n",
     "print(f\"Height = {im.get_height()}\")\n",
-    "print(f\"Pixels Per Image = {im.get_ppi()}\")\n",
+    "print(f\"Pixels Per Image = {im.get_npixels()}\")\n",
     "print(f\"Time = {im.get_obstime()}\")"
    ]
   },
@@ -461,7 +461,7 @@
     "# where the stack contains images of different sizes.\n",
     "print(f\"Width = {stack.get_width()}\")\n",
     "print(f\"Height = {stack.get_height()}\")\n",
-    "print(f\"Pixels Per Image = {stack.get_ppi()}\")\n",
+    "print(f\"Pixels Per Image = {stack.get_npixels()}\")\n",
     "\n",
     "# Retrieve a list of layered_images back from the stack.\n",
     "stack.get_images()\n",