diff --git a/aviary/docs/user_guide/hamilton_standard.ipynb b/aviary/docs/user_guide/hamilton_standard.ipynb
index 0a0e1b46b..4a4ebc653 100644
--- a/aviary/docs/user_guide/hamilton_standard.ipynb
+++ b/aviary/docs/user_guide/hamilton_standard.ipynb
@@ -19,8 +19,8 @@
     "from aviary.utils.doctape import check_value, get_variable_name, glue_variable\n",
     "from aviary.subsystems.atmosphere.atmosphere import Atmosphere\n",
     "\n",
-    "check_value(Aircraft.Engine.COMPUTE_PROPELLER_INSTALLATION_LOSS,'aircraft:engine:compute_propeller_installation_loss')\n",
-    "glue_variable(get_variable_name(Aircraft.Engine.COMPUTE_PROPELLER_INSTALLATION_LOSS), md_code=True)\n",
+    "check_value(Aircraft.Engine.Propeller.COMPUTE_PROPELLER_INSTALLATION_LOSS,'aircraft:engine:propeller:compute_propeller_installation_loss')\n",
+    "glue_variable(get_variable_name(Aircraft.Engine.Propeller.COMPUTE_PROPELLER_INSTALLATION_LOSS), md_code=True)\n",
     "glue_variable(get_variable_name(Atmosphere), md_code=True)\n",
     "glue_variable(get_variable_name(InstallLoss), md_code=True)\n",
     "glue_variable(get_variable_name(PreHamiltonStandard), md_code=True)\n",
@@ -40,7 +40,7 @@
     "You can find the definitions, methodology, and Fortran code in the document.\n",
     "In Aviary, we implement only one of the computation options: the code computes the corresponding thrust for a given horsepower.\n",
     "\n",
-    "Below is an XDSM diagram of Hamilton Standard model (assuming {glue:md}`Aircraft.Engine.COMPUTE_PROPELLER_INSTALLATION_LOSS` is `True`):\n",
+    "Below is an XDSM diagram of Hamilton Standard model (assuming {glue:md}`Aircraft.Engine.Propeller.COMPUTE_PROPELLER_INSTALLATION_LOSS` is `True`):\n",
     "\n",
     "![Hamilton Standard Diagram](images/hamilton_standard.png)\n",
     "\n",