diff --git a/template/exvivo_wm.nii.gz b/template/exvivo_wm.nii.gz
new file mode 100644
index 0000000..34f5d66
Binary files /dev/null and b/template/exvivo_wm.nii.gz differ
diff --git a/template/info_label.txt b/template/info_label.txt
index 62e32d4..c99ebba 100644
--- a/template/info_label.txt
+++ b/template/info_label.txt
@@ -3,6 +3,7 @@
 # ID, name, file
 1, T2w template, exvivo_t2.nii.gz
 3, spinal cord mask (binary), exvivo_cord.nii.gz
+4, white matter mask (probabilistic), exvivo_wm.nii.gz
 5, gray matter mask (probabilistic), exvivo_gm.nii.gz
 14, point-wise spinal level labels, exvivo_label_spinal_levels.nii.gz
 15, spinal cord mask with values corresponding to spinal levels, exvivo_spinal_levels.nii.gz