Document auto echo flag

Documentation/ReferenceManual/ReferenceManual.md

@@ -539,14 +539,15 @@ Currently, the **lowest 5** bits of the 64-bit value have a special use — the
 The 5 bits currently in use are:
 
 ```text
-0b00...00000OSFCZ
+0b00...0000AOSFCZ
 
 ... = 52 omitted bits
 Z = Zero flag
 C = Carry flag
 F = File end flag
 S = Sign flag
 O = Overflow flag
+A = Auto Echo flag
 ```
 
 Each bit of this number can be considered as a `true` (`1`) or `false` (`0`) value as to whether the flag is "set" or not.
@@ -2924,6 +2925,8 @@ Be aware that if the user types a character that requires multiple bytes to repr
 
 Note that the user does not need to press enter after inputting a character, execution will resume immediately after a single character is typed. If you wish to wait for the user to press enter, compare the inputted character to the newline character. The example program `input.ext.asm` contains a subroutine which does this. The user pressing the enter key will always give a single `10`/`0xA` newline byte, regardless of platform.
 
+By default, `RCC` will not show the character typed by the user on the console. To change this, the `TERM_AEE` instruction can be used. This instruction sets the *Auto Echo flag* in the `rsf` register, which instructs `RCC` to automatically output the inputted byte. Alternatively, you can use the `WCC` instruction immediately after using `RCC` to mimic this behaviour by passing the same register to `WCC` as was given to `RCC`. You can unset the Auto Echo flag with the `TERM_AED` instruction to restore the default behaviour.
+
 ## File Handling
 
 As well as interfacing with the console, AssEmbly also has native support for handling files.