diff --git a/cSpell.json b/cSpell.json
index a7aebacf295..d27b29ac30a 100644
--- a/cSpell.json
+++ b/cSpell.json
@@ -155,6 +155,7 @@
     "Unroller",
     "Vazirani",
     "Vedral",
+    "venv",
     "Watrous",
     "Weyl",
     "Woerner",
diff --git a/docs/start/install.mdx b/docs/start/install.mdx
index 7e12dd28111..aec3355ebff 100644
--- a/docs/start/install.mdx
+++ b/docs/start/install.mdx
@@ -8,6 +8,16 @@ description: Install and set up Qiskit and Qiskit Runtime on various operating s
 
 Whether you will work locally or in a cloud environment, the first step for all users is to install Qiskit®. For those wanting to run on a real system, your next step is to choose one of two channels in order to access IBM Quantum™ systems: IBM Quantum Platform or IBM Cloud®.
 
+<Admonition type="caution" title="Upgrade from Qiskit 0.x to Qiskit 1.0 and beyond">
+  (If you are installing Qiskit for the first time, skip ahead to the [Install and set up](#local) section. This notice is relevant only to users who have installed Qiskit previously.)
+
+  **For those upgrading from version 0.x to 1.0 or later**: note that because Qiskit 1.0 uses a new packaging structure, you **cannot** use `pip install -U qiskit` to upgrade from any Qiskit 0.x version to 1.0. 
+  
+  See the [Qiskit 1.0 migration guide](/api/migration-guides/qiskit-1.0) for details and instructions. 
+  
+  Future updates starting with Qiskit 1.0 will allow for in-place upgrades.  
+</Admonition>
+
 <span id="local"></span>
 ## Install and set up Qiskit with the Qiskit Runtime client