diff --git a/mdadm.8.in b/mdadm.8.in
index 34a93a8..c89d901 100644
--- a/mdadm.8.in
+++ b/mdadm.8.in
@@ -2408,9 +2408,11 @@ or
 .B \-\-update=
 option. The supported options are
 .BR name ,
-.B ppl
+.BR ppl ,
+.BR no\-ppl ,
+.BR bitmap
 and
-.BR no\-ppl .
+.BR no\-bitmap .
 
 The
 .B name
@@ -2428,6 +2430,13 @@ and
 options enable and disable PPL in the metadata. Currently supported only for
 IMSM subarrays.
 
+The
+.B bitmap
+and
+.B no\-bitmap
+options enable and disable write-intent bitmap in the metadata. Currently supported only for
+IMSM subarrays.
+
 .TP
 .B \-\-examine
 The device should be a component of an md array.
diff --git a/mdadm.c b/mdadm.c
index 493d70e..9a4317d 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -779,6 +779,8 @@ int main(int argc, char *argv[])
 				continue;
 			if (strcmp(c.update, "devicesize") == 0)
 				continue;
+			if (strcmp(c.update, "bitmap") == 0)
+				continue;
 			if (strcmp(c.update, "no-bitmap") == 0)
 				continue;
 			if (strcmp(c.update, "bbl") == 0)
@@ -827,7 +829,7 @@ int main(int argc, char *argv[])
 			fprintf(outf, "Valid --update options are:\n"
 		"     'sparc2.2', 'super-minor', 'uuid', 'name', 'nodes', 'resync',\n"
 		"     'summaries', 'homehost', 'home-cluster', 'byteorder', 'devicesize',\n"
-		"     'no-bitmap', 'metadata', 'revert-reshape'\n"
+		"     'bitmap', 'no-bitmap', 'metadata', 'revert-reshape'\n"
 		"     'bbl', 'no-bbl', 'force-no-bbl', 'ppl', 'no-ppl'\n"
 		"     'layout-original', 'layout-alternate', 'layout-unspecified'\n"
 				);