Update overview.md

Co-authored-by: Yaroslav Halchenko <[email protected]>

overview.md

@@ -21,6 +21,7 @@ Any change in the parameter of captured video (connect/disconnect, change of res
 These recordings are not yet considered “records” in that they are not matched to specific fMRI scans. 
 The server simply monitors the SPS for content and records everything. 
 These raw recordings will often contain long periods of screen capture that show the content of the display on experimenter’s stimulus presentation computer (often a lab laptop).  
+**Warning: as a result, captured video could contain sensitive data if it was displayed.**
 Therefore, it is necessary to take some precautions to store these files securely to protect experimenters information and privacy in case some personal information is exposed, such as an email inbox. 
 Consideration should be taken as to how long these raw recordings are kept, when they should be deleted, and where they will be stored. 
 For example, operators will need to provide sufficient hard drive space for this data and implement some policies about how long to keep the original raw data, after “records” parsed and procured to the fMRI archive.