diff --git a/conventions/extension-id.md b/conventions/extension-id.md
index 14c489a9..b725be8d 100644
--- a/conventions/extension-id.md
+++ b/conventions/extension-id.md
@@ -25,6 +25,6 @@ Everything about the extension id symmetrically applies to factory id.
 
 ## History
 
-Before this document was written, existing extension didn't honor those rules.
-Some stable extension include the string `draft` in their ID.
-We decided to keep those in order to maintain the binary compatibility.
\ No newline at end of file
+Before this document was written, existing extensions didn't honor these rules.
+Some stable extensions include the string `draft` in their ID.
+We decided to keep those in order to maintain binary compatibility.
\ No newline at end of file