diff --git a/clients/client-groundstation/src/models/models_0.ts b/clients/client-groundstation/src/models/models_0.ts
index 092052d825e2..aeed48fd0938 100644
--- a/clients/client-groundstation/src/models/models_0.ts
+++ b/clients/client-groundstation/src/models/models_0.ts
@@ -2088,7 +2088,18 @@ export interface S3Object {
 }
 
 /**
- * <p>Ephemeris data in Orbit Ephemeris Message (OEM) format.</p>
+ * <p>
+ *             Ephemeris data in Orbit Ephemeris Message (OEM) format.
+ *         </p>
+ *          <p>
+ *             Position, velocity, and acceleration units must be represented in <code>km</code>, <code>km/s</code>, and
+ *             <code>km/s**2</code>, respectively, in ephemeris data lines. Covariance matrix line units must be
+ *             represented in <code>km**2</code> if computed from two positions, <code>km**2/s</code> if computed from one
+ *             position and one velocity, and <code>km**2/s**2</code> if computed from two velocities. Consult section
+ *             7.7.2 of The Consultative Committee for Space Data Systems (CCSDS)
+ *             <a href="https://public.ccsds.org/Pubs/502x0b3e1.pdf">Recommended Standard for Orbit Data Messages</a>
+ *             for more information.
+ *         </p>
  * @public
  */
 export interface OEMEphemeris {
@@ -2186,7 +2197,18 @@ export namespace EphemerisData {
   }
 
   /**
-   * <p>Ephemeris data in Orbit Ephemeris Message (OEM) format.</p>
+   * <p>
+   *             Ephemeris data in Orbit Ephemeris Message (OEM) format.
+   *         </p>
+   *          <p>
+   *             Position, velocity, and acceleration units must be represented in <code>km</code>, <code>km/s</code>, and
+   *             <code>km/s**2</code>, respectively, in ephemeris data lines. Covariance matrix line units must be
+   *             represented in <code>km**2</code> if computed from two positions, <code>km**2/s</code> if computed from one
+   *             position and one velocity, and <code>km**2/s**2</code> if computed from two velocities. Consult section
+   *             7.7.2 of The Consultative Committee for Space Data Systems (CCSDS)
+   *             <a href="https://public.ccsds.org/Pubs/502x0b3e1.pdf">Recommended Standard for Orbit Data Messages</a>
+   *             for more information.
+   *         </p>
    * @public
    */
   export interface OemMember {
diff --git a/codegen/sdk-codegen/aws-models/groundstation.json b/codegen/sdk-codegen/aws-models/groundstation.json
index 1c2b11fb17cf..0dc8634340dd 100644
--- a/codegen/sdk-codegen/aws-models/groundstation.json
+++ b/codegen/sdk-codegen/aws-models/groundstation.json
@@ -4979,7 +4979,7 @@
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Ephemeris data in Orbit Ephemeris Message (OEM) format.</p>"
+        "smithy.api#documentation": "<p>\n            Ephemeris data in Orbit Ephemeris Message (OEM) format.\n        </p>\n         <p>\n            Position, velocity, and acceleration units must be represented in <code>km</code>, <code>km/s</code>, and\n            <code>km/s**2</code>, respectively, in ephemeris data lines. Covariance matrix line units must be\n            represented in <code>km**2</code> if computed from two positions, <code>km**2/s</code> if computed from one\n            position and one velocity, and <code>km**2/s**2</code> if computed from two velocities. Consult section\n            7.7.2 of The Consultative Committee for Space Data Systems (CCSDS)\n            <a href=\"https://public.ccsds.org/Pubs/502x0b3e1.pdf\">Recommended Standard for Orbit Data Messages</a>\n            for more information.\n        </p>"
       }
     },
     "com.amazonaws.groundstation#PaginationMaxResults": {