doc improvements

README.md

@@ -42,13 +42,10 @@ sudo apt update
 sudo apt upgrade
 ```
 
-### Required packages (some of these will probably already be installed)
+### Required packages (some of these may already be installed)
 
 ```bash
-sudo apt install git
-sudo apt install apache2 php5
-sudo apt install build-essential
-sudo apt install nlohmann-json3-dev
+sudo apt install git apache2 php5 build-essential nlohmann-json3-dev libcurl4-gnutls-dev
 ```
 
 ### Ham-DHT support (optional, but highly recommended)

config/urfd.ini

@@ -3,7 +3,7 @@
 # Do not use quotes, unless in a comment!
 
 [Names]
-Callsign = URF???	# where ? is A-Z or 0-9
+Callsign = URF???	# where ? is A-Z or 0-9. NO EXCEPTIONS!
 
 SysopEmail = me@somewhere.com