Update Flux-User-Guide.md

docs/flux/Flux-User-Guide.md

@@ -98,7 +98,7 @@ To learn about the available options of a command, execute Flux without argument
 To some commands the entire environment can be given as an argument. This is done with the `*` character: `fix("tranformation.fix", *)`. In this case Fix gains access to all variable assignments made in Flux.
 (See also [Addressing Pieces of Data: FIX-Path and the record structure in FIX ](../fix/Fix-User-Guide.html#addressing-pieces-of-data-fix-path-and-the-record-structure-in-fix)).
 
-Note that unlike shell pipes, the data flowing between Flux commands is _typed_. This means that only commands with matching signatures can be combined. Commands expect a certain input and provide a certain output like: `StreamReceiver`, `Object`, `Reader` and others.
+Note that unlike shell pipes, the data flowing between Flux commands is _typed_. This means that only commands with matching signatures can be combined. Commands expect a certain input and provide a certain output like: `StreamReceiver`, `Object`, `Reader`, `String`, `Triple` and others.
 
 To lookup the signatures, again: execute Flux without arguments. It will list all available commands, including signatures. Or simply have a look at the  [list of available FLUX commands in this documentation.](flux-commands.html)