diff --git a/modules/configuring-cluster-loader.adoc b/modules/configuring-cluster-loader.adoc
index 265c86b3c9..c9a353d0dd 100644
--- a/modules/configuring-cluster-loader.adoc
+++ b/modules/configuring-cluster-loader.adoc
@@ -76,6 +76,13 @@ completion of the previous step before continuing.
 This example assumes that references to any external template files or podspec
 files are also mounted into the container.
 
+[IMPORTANT]
+====
+If you are running Cluster Loader on Microsoft Azure, then you must set the
+`AZURE_AUTH_LOCATION` variable to a file that contains the output of
+`terraform.azure.auto.tfvars.json`, which is present in the installer directory.
+====
+
 == Configuration fields
 
 .Top-level Cluster Loader Fields