diff --git a/README.md b/README.md
index 14ab088..0e463e7 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,10 @@ Read the [`blacklight-collector` README](https://github.com/the-markup/blackligh
 
 All scans will be saved in the `outputs` folder, in subdirectories named for the hostname of the url being scanned.
 
+## Notes
+
+Be aware that the Collector is fairly resource-heavy, and may slow down your computer. We recommend scanning smaller lists if hardware becomes overtaxed.
+
 ## Testing
 
 `npm run test`