diff --git a/lib/krb5/deprecated.c b/lib/krb5/deprecated.c
index 6e56cb281..7a583cd12 100644
--- a/lib/krb5/deprecated.c
+++ b/lib/krb5/deprecated.c
@@ -447,6 +447,8 @@ krb5_free_error_string(krb5_context context, char *str)
  * @param context Kerberos context
  * @param fmt error message to free
  *
+ * @return Return an error code or 0.
+ *
  * @ingroup krb5_deprecated
  */
 
@@ -469,6 +471,8 @@ krb5_set_error_string(krb5_context context, const char *fmt, ...)
  * @param context Kerberos context
  * @param msg error message to free
  *
+ * @return Return an error code or 0.
+ *
  * @ingroup krb5_deprecated
  */