diff --git a/zUtil_Strain2/gtStrainPlaneNormals.m b/zUtil_Strain2/gtStrainPlaneNormals.m
index 521c40b4d84aa515188b9f9d0e483bb0c696845d..92f5e5fc01b58fa0c7ab3d1300234594d1b11bab 100644
--- a/zUtil_Strain2/gtStrainPlaneNormals.m
+++ b/zUtil_Strain2/gtStrainPlaneNormals.m
@@ -14,7 +14,7 @@ function [pldef, drel] = gtStrainPlaneNormals(pl, defT)
 %
 % INPUT
 %   pl    - normalised coordinates of plane normals (3xn)
-%   defT  - deformation tensor (3x3xn)
+%   defT  - deformation tensor(s) (3x3 or 3x3xn)
 %
 % OUTPUT
 %   pldef - plane normals in deformed state