diff --git a/releaseNotes.txt b/releaseNotes.txt
index e1e9a41..077bee2 100644
--- a/releaseNotes.txt
+++ b/releaseNotes.txt
@@ -7,7 +7,7 @@ Version 0.5.2:
 	
 	fixes:
 		- optimized CSP
-		- in Firefox ESR (52) iFrames with a blob-URL cannot be protected -> they have to blockes there as well
+		- in Firefox ESR (52) iFrames with a blob-URL cannot be protected -> they have to be blocked there as well
 	
 	known issues:
 		- if a data URL is blocked the page action button does not appear