vacancydisloop option added

README.md

@@ -165,9 +165,9 @@ This options adds an arbitrarily oriented dislocation into your model based on u
 -disloop loop_normal radius x y z bx by bz poisson
 ````
 
-This option deletes vacancies on a plane which when minimized should result in a dislocation loop structure. The arguments are below:
+This option imposes the displacement field for a dislocation in order to create a loop. This loop is unstable and will close if stress isn't applied.
 
-`dim` - The box dimension which defines the normal to the loop plane. As of now this dimension must be a closed back direction, meaning that for fcc a box dimension has to be of the (111) family of planes. Either `x`, `y`, or `z`.
+`loop_normal` - The box dimension which defines the normal to the loop plane. As of now this dimension must be a closed back direction, meaning that for fcc a box dimension has to be of the (111) family of planes. Either `x`, `y`, or `z`.
 
 `n` - The number of atoms to delete on the loop plane
 
@@ -177,6 +177,14 @@ This option deletes vacancies on a plane which when minimized should result in a
 
 `poisson` - Poisson ratio for continuum solution
 
+### Option vacancy_disloop
+
+```
+-vacancydisloop loop_normal radius x y z 
+```
+
+This option creates a circular planar vacancy cluster of radius `radius` normal to the `loop_normal` centered on position `x y z`. Upon relaxing or energy minimization this cluster should become a prismatic dislocation loop.
+
 ### Option Group
 
 `-group select_type group_shape shape_arguments additional keywords`