diff --git a/HOWTO b/HOWTO
index ec7005f..1362aea 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1248,6 +1248,19 @@
 
 			1		Backward-compatible alias for 'all'.
 
+ignore_error=str Sometimes you want to ignore some errors during test
+		 in that case you can specify error list for each error type.
+		 ignore_error=READ_ERR_LIST,WRITE_ERR_LIST,VERIFY_ERR_LIST
+		 errors for given error type is separated with ':'. Error
+		 may be symbol ('ENOSPC', 'ENOMEM') or integer.
+		 Example:
+			ignore_error=EAGAIN,ENOSPC:122
+		 This option will ignore EAGAIN from READ, and ENOSPC and 
+		 122(EDQUOT) from WRITE. 
+
+error_dump=bool If set dump every error even if it is non fatal, true
+		by default. If disabled only fatal error will be dumped
+				 
 cgroup=str	Add job to this control group. If it doesn't exist, it will
 		be created. The system must have a mounted cgroup blkio
 		mount point for this to work. If your system doesn't have it