Update README.md

README.md

@@ -12,12 +12,12 @@ The name *Homogram* comes from a prank on the name 'instagram', in fact differen
 First step, use the left side panel password and salt fields to create the hash to insert in the config file. Remember to manually set there also the salt value.   
 	   
 As you are going to run Homogram in the PHP process context, using a limited web server or phpfpm user, you must follow some simple directives for an optimal first setup:   
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 - Check the write permissions of your "HGRepo" folder in your web app public path; and set its path in the config file.   
 - Check the write permissions of your "data" folder in your web app private path; and set its path in the config file.
 - Set the default Locale.   
 - Set the default Context to PUBLIC or PRIVATE (for a private repository).  
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+- Every picture folder may contain a "thumbs" folder - that you should create - to not lack in performance.   
      
 Hope you can enjoy it and let us know about any feedback: <a href="mailto:info@homogram.org" style="color:#e6d236;">info@homogram.org</a>