diff --git a/conventions/extension-id.md b/conventions/extension-id.md
index 590e58d3..64173556 100644
--- a/conventions/extension-id.md
+++ b/conventions/extension-id.md
@@ -21,7 +21,7 @@ All extensions must go though the draft phase first.
 
 ## For factory ID
 
-Everything about the extension id simetrically applies to factory id.
+Everything about the extension id symmetrically applies to factory id.
 
 ## History