--- a/prepare_box.xml	Wed Apr 17 09:11:01 2019 -0400
+++ b/prepare_box.xml	Tue May 07 13:31:59 2019 -0400
@@ -12,18 +12,24 @@
         --bufy '$bufy'
         --bufz '$bufz'
         --exh '$exh'
+        #if $seed_value:
+            --seed '$seed_value'
+        #end if
     ]]></command>
     <inputs>
-        <param type="data" name="input1" format="mol" label="input ligand mol file"
+        <param type="data" name="input1" format="mol" label="Input ligand"
             help="The input ligand (mol file)"/>
         <param name="bufx" type="float" value="0" label="x-axis buffer"
-            help="the buffer in the x direction (in angs.)"/>
+            help="Buffer in the x direction (in angs.)"/>
         <param name="bufy" type="float" value="0" label="y-axis buffer"
-            help="the buffer in the y direction (in angs.)"/>
+            help="Buffer in the y direction (in angs.)"/>
         <param name="bufz" type="float" value="0" label="z-axis buffer"
-            help="the buffer in the z direction (in angs.)"/>
-        <param name="exh" type="integer" value="0" label="exhaustiveness"
-            help="The number of poses to return from docking job"/>
+            help="Buffer in the z direction (in angs.)"/>
+        <param name="exh" type="integer" value="0" label="Exhaustiveness"
+            help="Number of poses to return from docking job"/>
+        <!-- <param name="seed" type="boolean" label="Specify random seed for simulation reproducibility?"/> -->
+        <param type="integer" name="seed_value" optional="true" label="Random seed (optional)" 
+            help="Choose a seed value; if none is selected, a seed will be chosen randomly"/>
     </inputs>
     <outputs>
         <data name="output1" format="txt" />
@@ -35,14 +41,16 @@
             <param name="bufy" value="2" />
             <param name="bufz" value="3" />
             <param name="exh" value="10" />
+            <param name="seed_value" value="1" />
             <output name="output1" file="box_params.txt" />
         </test>
     </tests>
-    <help><![CDATA[
+    <help>
+<![CDATA[
 
 .. class:: infomark
 
-**Description:**
+**Description**
 
 This tool calculates a confounding box around an input ligand (mol file), and
 uses it to generate the input parameters for an autodock vina job.
@@ -51,46 +59,45 @@
 parameter file manually.
 
 -----
+
 .. class:: infomark
 
 **Inputs:**
 
 This tool requires:
-* An input ligand - This should be a mol file representing the ligand you wish to dock.
-This should be derived from the file you use to prepare the ligand for the docking job
-(see prepare ligand tool).
+
+* An input ligand - This should be a mol file representing the ligand you wish to dock. This should be derived from the file you use to prepare the ligand for the docking job (see prepare ligand tool).
 
-* OPTIONAL Buffers for each direction (x,y,z), which defaults to 0 angstroms. This value
-will be added to the confounding box that the tool generates in each respective direction.
-We recommend that you visualise the calculated box from an initial run of this tool, and
-calculate the expansion needed in each direction to cover the area of the binding site
-you wish to explore.
+* (OPTIONAL) Buffers for each direction (x,y,z), which defaults to 0 Å. This value will be added to the confounding box that the tool generates in each respective direction. We recommend that you visualise the calculated box from an initial run of this tool, and calculate the expansion needed in each direction to cover the area of the binding site you wish to explore.
+
 
 -----
+
 .. class:: infomark
 
 **Output:**
 
 The output for this tool is a txt file containing the parameters needed to run an autodock
-vina docking calculation with the docking tool. For example:
+vina docking calculation with the docking tool. For example: ::
 
-size_x =  12.443000000000001
-size_y =  11.888
-size_z =  9.290999999999997
-center_x =  -29.8395
-center_y =  4.364
-center_z =  -64.5925
-num_modes = 9999
-energy_range = 9999
-exhaustiveness = 10
-cpu = 4
-seed = 1
+    size_x =  12.443000000000001
+    size_y =  11.888
+    size_z =  9.290999999999997
+    center_x =  -29.8395
+    center_y =  4.364
+    center_z =  -64.5925
+    num_modes = 9999
+    energy_range = 9999
+    exhaustiveness = 10
+    cpu = 4
+    seed = 1
 
 The values for num_modes, energy range, cpu and seed are set to default values here.
 
 This file can be used as the box parameter for the docking tool.
 
-    ]]></help>
+]]>
+    </help>
     <citations>
         <citation type="bibtex">
             @article{rdkit,