diff --git a/README.md b/README.md
index ae31e45..8cff579 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,11 @@ Copyright ©2020–2022 Tony Garnock-Jones.
 SqueakPhone comes in two pieces: this is the `git`-based portion, and **there's another part
 that lives in [SqueakSource](https://squeaksource.com/SqueakPhone.html)**.
 
+## Loading the Smalltalk code into an existing image
+
+You can work with most of the codebase without actually running it on a phone. (In fact, it
+also makes sense to transfer images back and forth between desktop VMs and the phone.)
+
 The relevant packages to load into your Squeak image are:
 
 ```smalltalk
@@ -22,7 +27,7 @@ Installer squeaksource
 	install: 'SqueakPhone'.
 ```
 
-## Building/installing the system
+## Building/installing the system for on-phone use
 
 Follow these steps after [installing the base Synit
 system](https://synit.org/book/install.html).