diff --git a/azure/Guidelines.md b/azure/Guidelines.md
index b248ecea..be7517b3 100644
--- a/azure/Guidelines.md
+++ b/azure/Guidelines.md
@@ -320,7 +320,7 @@ There are 2 kinds of errors:
*NOTE: `x-ms-error-code` values are part of your API contract (because customer code is likely to do comparisons against them) and cannot change in the future.*
-:heavy_check_mark: **YOU MAY** implement the `x-ms-error-code` values as an enum with `"modelAsString": true` because it's possible add new values over time. In particular, it's only a breaking change if the same conditions result in a *different* top-level error code.
+:heavy_check_mark: **YOU MAY** implement the `x-ms-error-code` values as an enum with `"modelAsString": true` because it's possible to add new values over time. In particular, it's only a breaking change if the same conditions result in a *different* top-level error code.
:warning: **YOU SHOULD NOT** add new top-level error codes to an existing API without bumping the service version.