diff --git a/api/swagger.yaml b/api/swagger.yaml
index 610dc778d8..0be5c5b880 100644
--- a/api/swagger.yaml
+++ b/api/swagger.yaml
@@ -5700,8 +5700,8 @@ definitions:
           com.example.some-other-label: "some-other-value"
       Data:
         description: |
-          Data is the data to store as a secret, formatted as a Base64-url-safe-encoded
-          ([RFC 4648](https://tools.ietf.org/html/rfc4648#section-5)) string.
+          Data is the data to store as a secret, formatted as a standard base64-encoded
+          ([RFC 4648](https://tools.ietf.org/html/rfc4648#section-4)) string.
           It must be empty if the Driver field is set, in which case the data is
           loaded from an external secret store. The maximum allowed size is 500KB,
           as defined in [MaxSecretSize](https://pkg.go.dev/github.com/moby/swarmkit/v2@v2.0.0/api/validation#MaxSecretSize).
@@ -5755,8 +5755,8 @@ definitions:
           type: "string"
       Data:
         description: |
-          Data is the data to store as a config, formatted as a Base64-url-safe-encoded
-          ([RFC 4648](https://tools.ietf.org/html/rfc4648#section-5)) string.
+          Data is the data to store as a config, formatted as a standard base64-encoded
+          ([RFC 4648](https://tools.ietf.org/html/rfc4648#section-4)) string.
           The maximum allowed size is 1000KB, as defined in [MaxConfigSize](https://pkg.go.dev/github.com/moby/swarmkit/v2@v2.0.0-20250103191802-8c1959736554/manager/controlapi#MaxConfigSize).
         type: "string"
       Templating: