🐐 NVLLVS and string concatenation

README.md

@@ -67,6 +67,14 @@ Strings are written as text in quotes (`'` or `"`).
 DESIGNA x VT "this is a string"
 ```
 
+Strings are concatenated with `:`:
+
+```
+DESIGNA greeting VT "Hello, " : "world!"
+```
+
+`NVLLVS` coerces to an empty string when used with `:`. Note: `+` is for arithmetic only — using it on strings raises an error.
+
 ### Integers
 Integers must be written in roman numerals using the following symbols: