diff --git a/README.md b/README.md
index 82694ef..d5c16a5 100644
--- a/README.md
+++ b/README.md
@@ -49,9 +49,9 @@ Other optional arguments will be passed through to the
   Exclude one or more event types from consideration for archival.
   These event types are
   [documented](https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/Storm-Data-Bulk-csv-Format.pdf)
-  by the NCEI.  Must not be specified alongside `--type`.
+  by the NCEI.  Cannot be specified alongside `--type`.
 
 * `--type="Event Type"`
 
-  Explicitly specify which event types to archive.  Must not be
+  Explicitly specify which event types to archive.  Cannot be
   specified alongside `--exclude`.