diff --git a/super-intel.c b/super-intel.c
index 62ccd15..010226d 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -7251,6 +7251,30 @@ int imsm_takeover(struct supertype *st, struct geo_params *geo)
 	return 0;
 }
 
+static int warn_user_about_risk(void)
+{
+	int rv = 0;
+
+	fprintf(stderr,
+		"\nThis is an experimental feature. Data on the RAID volume(s) "
+		"can be lost!!!\n\n"
+		"To continue command execution please make sure that\n"
+		"the grow process will not be interrupted. Use safe power\n"
+		"supply to avoid unexpected system reboot. Make sure that\n"
+		"reshaped container is not assembled automatically during\n"
+		"system boot.\n"
+		"If reshape is interrupted, assemble array manually\n"
+		"using e.g. '-Ac' option and up to date mdadm.conf file.\n"
+		"Assembly in scan mode is not possible in such case.\n"
+		"Growing container with boot array is not possible.\n"
+		"If boot array reshape is interrupted, whole file system\n"
+		"can be lost.\n\n");
+	rv = ask("Do you want to continue? ");
+	fprintf(stderr, "\n");
+
+	return rv;
+}
+
 static int imsm_reshape_super(struct supertype *st, long long size, int level,
 			      int layout, int chunksize, int raid_disks,
 			      int delta_disks, char *backup, char *dev,
@@ -7283,6 +7307,14 @@ static int imsm_reshape_super(struct supertype *st, long long size, int level,
 		/* On container level we can only increase number of devices. */
 		dprintf("imsm: info: Container operation\n");
 		int old_raid_disks = 0;
+
+		/* this warning will be removed when imsm checkpointing
+		 * will be implemented, and restoring from check-point
+		 * operation will be transparent for reboot process
+		 */
+		if (warn_user_about_risk() == 0)
+			return ret_val;
+
 		if (imsm_reshape_is_allowed_on_container(
 			    st, &geo, &old_raid_disks)) {
 			struct imsm_update_reshape *u = NULL;