diff --git a/docs/seps/2243-http-standardization.mdx b/docs/seps/2243-http-standardization.mdx
index 45b29718b..7670db93e 100644
--- a/docs/seps/2243-http-standardization.mdx
+++ b/docs/seps/2243-http-standardization.mdx
@@ -770,7 +770,7 @@ This section defines edge cases that conformance tests MUST cover to ensure inte
 | Invalid Base64 characters | `=?base64?SGVs!!!bG8=?=` | Server MUST reject with 400 and error code `-32001`; Intermediary MAY reject with 400 status code |
 | Missing prefix            | `SGVsbG8=`               | Server treats as literal value, not Base64                                                        |
 | Missing suffix            | `=?base64?SGVsbG8=`      | Server treats as literal value, not Base64                                                        |
-| Malformed wrapper         | `=?BASE64?SGVsbG8=?=`    | Server MUST accept (case-insensitive prefix)                                                      |
+| Non-lowercase prefix      | `=?BASE64?SGVsbG8=?=`    | Server treats as literal value, not Base64                                                        |
 
 #### Null and Missing Values
 
diff --git a/seps/2243-http-standardization.md b/seps/2243-http-standardization.md
index 2faf69583..ac908d600 100644
--- a/seps/2243-http-standardization.md
+++ b/seps/2243-http-standardization.md
@@ -754,7 +754,7 @@ This section defines edge cases that conformance tests MUST cover to ensure inte
 | Invalid Base64 characters | `=?base64?SGVs!!!bG8=?=` | Server MUST reject with 400 and error code `-32001`; Intermediary MAY reject with 400 status code |
 | Missing prefix            | `SGVsbG8=`               | Server treats as literal value, not Base64                                                        |
 | Missing suffix            | `=?base64?SGVsbG8=`      | Server treats as literal value, not Base64                                                        |
-| Malformed wrapper         | `=?BASE64?SGVsbG8=?=`    | Server MUST accept (case-insensitive prefix)                                                      |
+| Non-lowercase prefix      | `=?BASE64?SGVsbG8=?=`    | Server treats as literal value, not Base64                                                        |
 
 #### Null and Missing Values