diff --git a/README.md b/README.md
index 7fbbf0a..730aa9f 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@
 
 Please see my 2014 write-up __[dealing with variable options (varargin) in matlab](https://bahanonu.com/getOptions)__ ([https://bahanonu.com/getOptions](https://bahanonu.com/getOptions)) for details and reasons behind implementing and using this function. Installation and usage instructions below.
 
+Also find function on MATLAB File Exchange: [![View getOptions on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/75464-getoptions).
+
 Contact: __Biafra Ahanonu, PhD (bahanonu [at] alum [dot] mit [dot] edu)__.
 
 Made in USA.<br>
@@ -18,6 +20,8 @@ Test by running `unitTestGetOptions` unit test. Will print out the modified stru
 ## Instructions on use
 There are two ways to have parent functions pass Name-Value pairs to child functions that `getOptions` will parse to update default options in child function.
 
+__Note__ that `getOptions` has a `recursiveStructs` optional Name-Value input argument itself that if enabled (the default), causes `getOptions` to crawl through any options that are structures and replace only fieldnames that are present in the options passed by the parent function. If this is disabled, `getOptions` will replace any options that are structures with the entire structure input by the user regardless of whether the default options had a specific structure.
+
 ### Method #1
 Use the `'options', options` [Name-Value](https://www.mathworks.com/help/matlab/ref/varargin.html) pair to input an `options` structure that will overwrite default options in a function.
 - The name of the `opts` variable does not matter, but have to have the `options` Name input as one of the variable arguments for `getOptions` to recognize using Method #1.
diff --git a/getOptions.m b/getOptions.m
index c655b2a..d3a8185 100644
--- a/getOptions.m
+++ b/getOptions.m
@@ -4,27 +4,30 @@
 	% Started: 2013.11.04.
 	%
 	% inputs
-		% options - structure with options.
+		% options - structure passed by parent function with each fieldname containing an option to be used by the parent function.
 		% inputArgs - an even numbered cell array, with {'option','value'} as the ordering. Normally pass varargin.
 	% Outputs
-		% options - options structure with inputs to function added.
+		% options - options structure passed back to parent function with modified Name-Value inputs to function added.
 	% NOTE
-		% use the 'options' name-value pair to input an options structure that will overwrite default options in a function, example below.
+		% Use the 'options' name-value pair to input an options structure that will overwrite default options in a function, example below.
 		% options.Stargazer = 1;
 		% options.SHH = 0;
 		% getMutations(mutationList,'options',options);
-
+		%
 		% This is in contrast to using name-value pairs, both will produce the same result.
 		% getMutations(mutationList,'Stargazer',1,'SHH',0);
-	%
+		%
 	% USAGE
 		% function [input1,input2] = exampleFxn(input1,input2,varargin)
 		% 	%========================
 		% 	% DESCRIPTION
 		% 	options.Stargazer = '';
+		%	% DESCRIPTION
 		% 	options.SHH = '';
+		%	% DESCRIPTION
+		% 	options.Option3 = '';
 		% 	% get options
-		% 	options = getOptions(options,varargin);
+		% 	options = getOptions(options,varargin); % ***HERE IS WHERE getOptions IS USED***
 		% 	% display(options)
 		% 	% unpack options into current workspace
 		% 	% fn=fieldnames(options);
@@ -48,15 +51,17 @@
 		% 2015.08.24 [23:31:36] - updated comments. - Biafra
 		% 2015.12.03 [13:52:15] - Added recursive aspect to mirrorRightStruct and added support for handling struct name-value inputs. mirrorRightStruct checks that struct options input by the user are struct in the input options. - Biafra
 		% 2016.xx.xx - warnings now show both calling function and it's parent function, improve debug for warnings. Slight refactoring of code to make easier to follow. - Biafra
+		% 2020.05.10 [18:00:23] - Updates to comments in getOptions and other minor changes.
 
 	% TODO
-		% allow input of an option structure - DONE!
-		% call settings function to have defaults for all functions in a single place - DONE!
-		% allow recursive overwriting of options structure - DONE!
+		% Allow input of an option structure - DONE!
+		% Call settings function to have defaults for all functions in a single place - DONE!
+		% Allow recursive overwriting of options structure - DONE!
 		% Type checking of all field names input by the user?
 
 	%========================
-	% Options for getOptions. Avoid recursion here, hence don't use getOptions for getOptions's options.
+	% Options for getOptions.
+	% Avoid recursion here, hence don't use getOptions for getOptions's options.
 	% Binary: 1 = whether getOptions should use recursive structures or crawl through a structure's field names or just replace the entire structure. For example, if "1" then options that themselves are a structure or contain sub-structures, the fields will be replaced rather than the entire strucutre.
 	goptions.recursiveStructs = 1;
 	% Binary: 1 = show warning if user inputs Name-Value pair option input that is not in original structure.
@@ -65,7 +70,7 @@
 	goptions.nParentStacks = 1;
 	% Binary: 1 = get defaults for a function from getSettings.
 	goptions.getFunctionDefaults = 0;
-	% Filter through options
+	% Update getOptions's options based on user input.
 	try
 		for i = 1:2:length(varargin)
 			inputField = varargin{i};
@@ -175,7 +180,7 @@ function localShowWarnings(stackLevel,displayType,toStructName,fromField,val,nPa
 		% Get the entire function-call stack.
 		[ST,~] = dbstack;
 		callingFxn = ST(stackLevel).name;
-		callingFxnPath=which(ST(stackLevel).file);
+		callingFxnPath = which(ST(stackLevel).file);
 		callingFxnLine = num2str(ST(stackLevel).line);
 
 		% Add info about parent function of function that called getOptions.