diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,17 +1,51 @@
 # jspsych-spr-mw
-A self paced reading with moving window experiment using jsPsych
+##A self paced reading with moving window experiment using jsPsych
 
-# Adapting stimuli
+## Make your experiment ready for use with the data server
+### Update access key
+In the file globals.js is a variable:
+```javascript
+const ACCESS_KEY = '00000000-0000-0000-0000-000000000000';
+```
+For uploading to the UiL-OTS data server you need to change this
+to the access_key that you have obtained when your experiment has
+been approved. Your personal access key should look identical, but
+all the '0' have changed. For elaborate info see globals.js.
+
+### Adapting stimuli
 In the file stimuli.js are a number of variables you can tweak
 in order to adapt the stimuli the participants sees. There
 are by default 2 groups, each group gets its own 
 list of stimuli assigned. This list can be used to implement
-the latin square. In the boilerplate are sententces in an
+the Latin square. In the boilerplate are sententces in an
 active, passive and filler condition. The two list complement
 each other, so an active stimulus in the first list is complemented
 with a passive stimulus in the second list. Participants
-assigned to the first group get the first list, participants assigend
+assigned to the first group get the first list, participants assigned
 to the second group get the 2nd list. You can add additional groups
 and list if your experiment requires this. This would make it more difficult
-to implement the latin sqare.
+to implement the Latin square.
 
+### Presenting multiple words as one group
+The boilerplate experiment treats every word in the stimuli as a
+group of its own containing one word. Sometimes it is handy to group
+multiple words together, to shorten the time it takes to complete the
+experiment for example. This is possible, but must be enabled. In the file
+globals.js is another variable:
+```javascript
+const GROUPING_STRING = null;
+```
+To enable grouping you must define a useful delimiter between groups.
+A little bit further in the file is a commented version of:
+```javascript
+const GROUPING_STRING = "/";
+```
+So in order to enable grouping comment the first version and uncomment
+the latter. In theory you can fill out any string instead of the `"/"`.
+Notice the string is turned into a regular expression in order to split
+the stimulus into parts and to remove the `/` in the case described here.
+```javascript
+re = RegExp(GROUPING_STRING,'gu');
+```
+So make sure if you are going to be creative, that the expression is valid.
+### Goodluck, hopefully this experiment is usefull to you.