diff --git a/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h b/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h
index 4835da1f..2ceb4315 100644
--- a/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h
+++ b/libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h
@@ -1037,6 +1037,10 @@ OEMCryptoResult OEMCrypto_GenerateDerivedKeys(
  * OEMCrypto_LoadLicense() proceed in the same manner for license requests using
  * RSA or using a Widevine keybox token.
  *
+ * This function is also used to derive keys before processing a Cast
+ * Certificate provisioning response in OEMCrypto_LoadProvisioning().
+ * See [Cast Receiver](../../cast) for more details.
+ *
  * @verification
  *   If the RSA key's allowed_schemes is not kSign_RSASSA_PSS, then no keys are
  *   derived and the error OEMCrypto_ERROR_INVALID_KEY is returned. An RSA