diff --git a/aip/general/0203.md b/aip/general/0203.md
index 7de5e39f2..b60deba51 100644
--- a/aip/general/0203.md
+++ b/aip/general/0203.md
@@ -36,7 +36,7 @@ many clients (e.g. CLIs and SDKs) rely on them to generate code. Thoroughly
 review and consider which values are relevant when adding a new field.
 
 Fields with no annotation are interpreted as `OPTIONAL` for
-backwards-compatility. Nontheless, this annotation **must not** be omitted.
+backwards-compatibility. Nontheless, this annotation **must not** be omitted.
 
 **Note:** The vocabulary given in this document is for _descriptive_ purposes
 only, and does not itself add any validation. The purpose is to consistently