diff --git a/proposals/FileSystemObserver.md b/proposals/FileSystemObserver.md
index 4dcd986..13eba2e 100644
--- a/proposals/FileSystemObserver.md
+++ b/proposals/FileSystemObserver.md
@@ -659,7 +659,7 @@ enum FileSystemChangeType {
   "disappeared",
   "modified",
   "moved",
-  "unknown",      // Change types are not known.
+  "unknown",      // Change types are not known
   "errored"       // This observation is no longer valid
 };