diff --git a/README.md b/README.md
index 8fcb3d0..c9a9cf9 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,10 @@ Presumably works for other nomie 5.x versions and other Loop 2.x versions as wel
 ## Usage 
 
 Currently takes a single argument, the nomie database file, and will output to `output.db` in present working directory.
+Can also take an existing Loop Habit database (exported from the application), 
+and add the nomie exported habits and checkmarks to it.
+Simply put the exported Loop database in the same directory and call it `output.db`, 
+it will not (should not) overwrite anything.
 
 Invoked like: `python migrate.py nomie-export.json`