diff --git a/README.md b/README.md
index bd71934..a52bb31 100644
--- a/README.md
+++ b/README.md
@@ -30,10 +30,20 @@ Product installation failed.
 
 Use a compatible Mac or select a different build compatible with your current hardware and try again. You may also have success running the script in a VM; the InstallationCheck script in versions of the macOS installer to date skips the checks (and returns success) when run on a VM. 
 
-##### important note for Catalina+
+##### Important note for Catalina+
 Catalina privacy protections might interfere with the operation of this tool if you run it from ~/Desktop, ~/Documents, ~/Downloads or other directories protected in Catalina. Consider using /Users/Shared (or subdirectory) as the "working space" for this tool.
 
-Graham Pugh has a fork with a lot more features and bells and whistles. Check it out if your needs aren't met by this tool. https://github.com/grahampugh/macadmin-scripts
+##### October 2020 update
+In late September, Apple made some changes to how their servers returned requested results. This led to `installinstallmacos.py` complaining about invalid XML and listing macOS installers with UNKNOWN build numbers, among other issues.
+If you encounter these issues:
+  - Update to the current version of the script
+  - Run it at least once with the `--ignore-cache` option, or remove the content directory to remove corrupted files in the content cache.
+
+##### Alternate implementations
+Graham Pugh has a fork with a lot more features and bells and whistles. Check it out if your needs aren't met by this tool.
+https://github.com/grahampugh/macadmin-scripts
+
+### Legacy scripts no longer in development or supported
 
 #### createbootvolfromautonbi.py