Fix grammatical error
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index 081e7bb..8aa9f2f 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -549,7 +549,7 @@
This affects applications that call the `mbedtls_x509write_csr_set_extension`
function.
-The API is changed to include the parameter `critical` which allow to mark an
+The API is changed to include the parameter `critical` which enables marking an
extension included in a CSR as critical. To get the previous behavior pass 0.
### Remove the config option MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
