diff --git a/include/mbedtls/asn1.h b/include/mbedtls/asn1.h
index be2cae7..21ade1b 100644
--- a/include/mbedtls/asn1.h
+++ b/include/mbedtls/asn1.h
@@ -38,8 +38,9 @@
 
 /**
  * \name ASN1 Error codes
- * These error codes are OR'ed to X509 error codes for
+ * These error codes are combined with other error codes for
  * higher error granularity.
+ * e.g. X.509 and PKCS #7 error codes
  * ASN1 is a standard to specify data structures.
  * \{
  */