diff --git a/include/mbedtls/x509_crl.h b/include/mbedtls/x509_crl.h
index 6f4b65d..28507a5 100644
--- a/include/mbedtls/x509_crl.h
+++ b/include/mbedtls/x509_crl.h
@@ -73,7 +73,7 @@
     x509_buf tbs;           /**< The raw certificate body (DER). The part that is To Be Signed. */
 
     int version;            /**< CRL version (1=v1, 2=v2) */
-    x509_buf sig_oid1;
+    x509_buf sig_oid;       /**< CRL signature type identifier */
 
     x509_buf issuer_raw;    /**< The raw issuer data (DER). */