diff --git a/@TDAmeritrade/getFundamental.m b/@TDAmeritrade/getFundamental.m
index 238fa21..625c9ab 100644
--- a/@TDAmeritrade/getFundamental.m
+++ b/@TDAmeritrade/getFundamental.m
@@ -1,8 +1,10 @@
 % get fundamental info
-function fdata = getFundamental(self, progressbar, UseCache)
+function fdata = getFundamental(self, o)
 
-if nargin < 3 
-	UseCache = true;
+arguments
+	self (1,1) TDAmeritrade
+	o.ProgressBar matlab.ui.dialog.ProgressDialog
+	o.UseCache (1,1) logical = true
 end
 
 cloc = fullfile(userpath,'tdameritrade','fundamental_data');
@@ -15,15 +17,15 @@
 
 
 	% progress
-	if nargin > 1 && isa(progressbar,'matlab.ui.dialog.ProgressDialog')
-		progressbar.Value = (length(self.tickers) - i)/length(self.tickers);
-		progressbar.Message = ['Downloading fundamental data: ' T];
+	if nargin > 1 && isa(o.ProgressBar,'matlab.ui.dialog.ProgressDialog')
+		o.ProgressBar.Value = (length(self.tickers) - i)/length(self.tickers);
+		o.ProgressBar.Message = ['Downloading fundamental data: ' T];
 	else
 		disp(T)
 	end
 
 	% first check the cache
-	if UseCache
+	if o.UseCache
 		try
 			load(fullfile(cloc,[T '.mat']),'FunData')
 			fdata(i) = FunData;
@@ -37,7 +39,7 @@
 	curl_str = 'https://api.tdameritrade.com/v1/instruments?&symbol=TICKER&projection=fundamental&apikey=';
 
 	curl_str = strrep(curl_str,'TICKER',T);
-	curl_str = [curl_str self.API_key];
+	curl_str = [curl_str self.APIKey];
 	data = webread(curl_str);
 
 	try
diff --git a/@TDAmeritrade/getPriceHistory.m b/@TDAmeritrade/getPriceHistory.m
index 2f2c90e..9809251 100644
--- a/@TDAmeritrade/getPriceHistory.m
+++ b/@TDAmeritrade/getPriceHistory.m
@@ -20,7 +20,7 @@
 
 	curl_str = strrep(curl_str,'END_DATE',mat2str(posixtime(self.EndDate)*1000));
 	curl_str = strrep(curl_str,'START_DATE',mat2str(posixtime(self.StartDate)*1000));
-	curl_str = [curl_str self.API_key];
+	curl_str = [curl_str self.APIKey];
 	temp = webread(curl_str);
 
 	if temp.empty 
diff --git a/README.md b/README.md
index 9ff00ad..2270467 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,16 @@ data = T.getPriceHistory;
 
 Currently, only daily information is available, but future work will support all available frequencies. 
 
+You can plot this using:
+
+```
+plot(data(1).Time,data(1).Close)
+```
+
+and you should get something like this:
+
+![](https://user-images.githubusercontent.com/6005346/111885025-a9677d00-899b-11eb-9300-211822763cfc.png)
+
 ### Get delayed quotes 
 
 ```matlab
@@ -58,16 +68,16 @@ returns a structure array with various fundamental information (e.g., `quickRati
 This information is cached on disk, so subsequent calls will load from the cache and will not ping TDA's servers. If you want to force a fetch from the server, use:
 
 ```
-f = T.getFundamental([],false);
+f = T.getFundamental('UseCache',false);
 ```
 
 ### Get option chain
 
 ```
-o = T.getOptionChain;
+o = T.getOptionChain('Type','Call');
 ```
 
-returns the full option chain for the symbols requested. 
+returns the full option chain for the symbols requested. Results are returned as an array of [OptionContract](https://github.com/sg-s/tdameritrade-matlab-api/blob/main/OptionContract.m). 
 
 ### Get transactions from account