diff --git a/README.md b/README.md
index d390177..c8eb22b 100644
--- a/README.md
+++ b/README.md
@@ -111,4 +111,28 @@ This mode merges multiple data files and creates one big simulation cell. The pa
 
 `N` - The number of files which are being read
 
-`dim` - the dimension they are to be stacked along, can be either `x`, `y`, or `z`. If the argument `none` is passed then the cells are just overlaid. Future options will include a delete overlap command.
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+`dim` - the dimension they are to be stacked along, can be either `x`, `y`, or `z`. If the argument `none` is passed then the cells are just overlaid. Future options will include a delete overlap command.
+
+## Options
+
+Options are additional portions of code which have additional functionality. Options are performed in the order that they appear in the argument list and can be added to any mode. If wanting to use strictly options use `--convert` to specify input and output files.
+
+### Option dislgen
+
+```
+-dislgen [ijk] [hkl] x y z char_angle poisson 
+```
+
+
+
+This options adds an arbitrarily oriented dislocation into your model based on user inputs using the volterra displacement fields. The options are below
+
+`[ijk]` - The vector for the line direction
+
+`[hkl]` - The vector for the slip plane 
+
+`x y z` - The position of the dislocation centroid
+
+`char_angle` - Character angle of the dislocation (0 is screw and 90 is edge)
+
+`poisson` - Poisson's ratio used for the displacement field.
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diff --git a/src/Makefile b/src/Makefile
index c84186e..a55e152 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,8 +1,9 @@
 FC=ifort
 #FFLAGS=-mcmodel=large -g -O0 -stand f08 -fpe0 -traceback -check bounds,uninit -warn all -implicitnone -no-wrap-margin
-FFLAGS=-mcmodel=large -Ofast
+FFLAGS=-mcmodel=large -Ofast -no-wrap-margin
 MODES=mode_create.o mode_merge.o mode_convert.o
-OBJECTS=main.o elements.o io.o subroutines.o functions.o atoms.o call_mode.o box.o $(MODES)
+OPTIONS=opt_disl.o
+OBJECTS=main.o elements.o io.o subroutines.o functions.o atoms.o call_mode.o box.o call_option.o $(MODES) $(OPTIONS)
 
 .SUFFIXES:
 .SUFFIXES: .c .f .f90 .F90 .o
@@ -25,9 +26,10 @@ cleantest:
 	$(RM) testfuncs testfuncs.o
 
 $(OBJECTS) : parameters.o
-atoms.o subroutines.o testfuncs.o : functions.o
-main.o io.o build_subroutines.o: elements.o 
+atoms.o subroutines.o testfuncs.o box.o : functions.o
+main.o io.o $(MODES) $(OPTIONS) : elements.o 
 call_mode.o : $(MODES)
+call_option.o : $(OPTIONS)
 $(MODES) io.o: atoms.o box.o
 $(MODES) main.o : io.o
-testfuncs.o elements.o mode_create.o: subroutines.o
+testfuncs.o elements.o mode_create.o opt_disl.o: subroutines.o
diff --git a/src/box.f90 b/src/box.f90
index 3043851..de34e23 100644
--- a/src/box.f90
+++ b/src/box.f90
@@ -1,7 +1,7 @@
 module box
     !This module contains information on the properties of the current box.
     use parameters
-
+    use functions
     implicit none 
 
     real(kind=dp) :: box_bd(6) !Global box boundaries
@@ -34,8 +34,14 @@ module box
 
         integer, intent(in) :: n
 
-        allocate(sub_box_ori(3,3,n), sub_box_bd(6,n), sub_box_array_bd(2,2,n))
+        integer :: i
 
+        allocate(sub_box_ori(3,3,n), sub_box_bd(6,n), sub_box_array_bd(2,2,n))
+        do i = 1, n
+            sub_box_ori(:,:,i) = identity_mat(3)
+            sub_box_bd(:,i) = 0.0_dp
+            sub_box_array_bd(:,:,i) = 1
+        end do
     end subroutine alloc_sub_box
 
     subroutine grow_sub_box(n)
@@ -58,7 +64,7 @@ module box
         call move_alloc(temp_bd, sub_box_bd)
 
         temp_array_bd(:,:,1:sub_box_num) = sub_box_array_bd
-        temp_array_bd(:,:,sub_box_num+1:) = 0.0_dp
+        temp_array_bd(:,:,sub_box_num+1:) = 1
         call move_alloc(temp_array_bd, sub_box_array_bd)
 
         return
diff --git a/src/functions.f90 b/src/functions.f90
index eb8e813..f340b86 100644
--- a/src/functions.f90
+++ b/src/functions.f90
@@ -232,4 +232,14 @@ END FUNCTION StrDnCase
         end if
     return
     end function is_equal
+
+    pure function unitvec(n,vec)
+        integer, intent(in) :: n
+        real(kind=dp), intent(in) :: vec(n)
+        real(kind=dp) :: unitvec(n)
+
+        unitvec = vec/norm2(vec)
+        return
+    end function unitvec
+
 end module functions
diff --git a/src/io.f90 b/src/io.f90
index 6e914b2..46ece37 100644
--- a/src/io.f90
+++ b/src/io.f90
@@ -409,7 +409,7 @@ module io
         end do
 
         !Write the number of atom types in the current model and all of their names
-        write(11,*) atom_types, (type_to_name(i), i=1, atom_types)
+        write(11,*) atom_types, (type_to_name(i)//' ', i=1, atom_types)
         !Write the number of lattice_types, basisnum and number of nodes for each lattice type
         write(11,*) lattice_types, (basisnum(i), i = 1, lattice_types), (ng_node(i), i = 1, lattice_types)
         !Now for every lattice type write the basis atom types
@@ -544,10 +544,14 @@ module io
             read(11,*) sub_box_bd(:,sub_box_num+i)
             sub_box_bd(:,sub_box_num+i) = sub_box_bd(:, sub_box_num+i) + displace(:)
             !Read in sub_box_array_bd
-            read(11,*) ((sub_box_ori(j, k, sub_box_num+i), j = 1, 2), k = 1, 2)
-
+            read(11,*) ((sub_box_array_bd(j, k, sub_box_num+i), j = 1, 2), k = 1, 2)
         end do
-            sub_box_num = sub_box_num + n
+
+        !Add the existing element boundaries
+        sub_box_array_bd(:,1,sub_box_num+1:) = sub_box_array_bd(:,1,sub_box_num+1:) + atom_num
+        sub_box_array_bd(:,2,sub_box_num+1:) = sub_box_array_bd(:,2,sub_box_num+1:) + ele_num
+
+        sub_box_num = sub_box_num + n
 
         !Read in the number of atom types and all their names
         read(11, *) new_atom_types, (new_type_to_name(i), i = 1, new_atom_types)
diff --git a/src/main.f90 b/src/main.f90
index a681d33..6bdc0ed 100644
--- a/src/main.f90
+++ b/src/main.f90
@@ -17,7 +17,7 @@ program main
     use io
     
 
-    integer ::  i, end_mode_arg, arg_num
+    integer ::  i, end_mode_arg, arg_num, arg_pos
     character(len=100) ::  argument
 
     !Call initialization functions
@@ -37,12 +37,25 @@ program main
     end if
 
     !Now we loop through all of the arguments and check for passed options or for a filename to be written out
-    do i = end_mode_arg-1, arg_num
-        call get_command_argument(i, argument)
+    arg_pos = end_mode_arg
+    do while(.true.)
+        !Exit the loop if we are done reading
+        if(arg_pos > arg_num) exit
+
+        call get_command_argument(arg_pos, argument)
 
         !Check to see if a filename was passed
         if(scan(argument,'.',.true.) > 0) then 
             call get_out_file(argument)
+            arg_pos = arg_pos + 1
+
+        !Check to see if an option has been passed
+        else if(argument(1:1) == '-') then 
+            call call_option(argument, arg_pos)
+        !Otherwise print that the argument is not accepted and move on
+        else
+            print *, trim(adjustl(argument)), " is not accepted. Skipping to next argument"
+            arg_pos = arg_pos + 1
         end if
     end do
 
diff --git a/src/mode_create.f90 b/src/mode_create.f90
index bac9b12..ee35488 100644
--- a/src/mode_create.f90
+++ b/src/mode_create.f90
@@ -230,10 +230,10 @@ module mode_create
 
             case default
                 !If it isn't an option then you have to exit
+                arg_pos = arg_pos -1
                 exit
             end select
         end do
-
         !Calculate the lattice periodicity length in lattice units
         do i = 1, 3
             lattice_space(i) = norm2(orient(i,:))
diff --git a/src/parameters.f90 b/src/parameters.f90
index 0443622..b54a702 100644
--- a/src/parameters.f90
+++ b/src/parameters.f90
@@ -2,7 +2,12 @@ module parameters
 
     implicit none
 
+    !Default precision
     integer, parameter :: dp= selected_real_kind(15,307)
+    !Parameters for floating point tolerance
     real(kind=dp), parameter :: lim_zero = epsilon(1.0_dp), &
                                 lim_large = huge(1.0_dp)
+    !Numeric constants
+    real(kind=dp), parameter :: pi = 3.14159265358979323846_dp
+
 end module parameters
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diff --git a/src/subroutines.f90 b/src/subroutines.f90
index f4447d7..d0b004b 100644
--- a/src/subroutines.f90
+++ b/src/subroutines.f90
@@ -1,6 +1,7 @@
 module subroutines
     use parameters
     use functions
+    use box
     implicit none
 
     integer :: allostat, deallostat
@@ -170,4 +171,36 @@ module subroutines
         return
     end subroutine parse_ori_vec
 
+    subroutine parse_pos(i, pos_string, pos)
+        !This subroutine parses the pos command allowing for command which include inf
+        integer, intent(in) ::  i !The dimension of the position
+        character(len=100), intent(in) :: pos_string !The position string
+        real(kind=dp), intent(out) :: pos !The output parsed position value
+
+        integer :: iospara
+        if(trim(adjustl(pos_string)) == 'inf') then 
+            pos=box_bd(2*i)
+        else if(trim(adjustl(pos_string)) == '-inf') then
+            pos=box_bd(2*i-1)
+        else if ((index(pos_string,'-') > 0).and.(index(pos_string,'inf')>0)) then 
+            !Now extract the number we are reducing from infinity
+            read(pos_string(index(pos_string,'-')+1:), *, iostat=iospara) pos
+            pos = box_bd(2*i) - pos
+        else if ((index(pos_string,'+') > 0).and.(index(pos_string,'inf')>0)) then 
+            !Now extract the number we are reducing from infinity
+            read(pos_string(index(pos_string,'+')+1:), *, iostat=iospara) pos
+            pos = box_bd(2*i-1) + pos
+        else if ((index(pos_string,'*') > 0).and.(index(pos_string,'inf')>0)) then 
+            !Now extract the number we are reducing from infinity
+            read(pos_string(index(pos_string,'*')+1:), *, iostat=iospara) pos
+            pos = (box_bd(2*i)-box_bd(2*i-1))*pos
+        else
+            read(pos_string, *, iostat=iospara) pos
+        end if
+
+        if (iospara > 0) then 
+            print *, "Error reading position argument ", trim(adjustl(pos_string)), ". Please reformat and try again."
+        end if
+    end subroutine parse_pos
+
 end module subroutines
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