Help with spaces and rules

Guys and Gals I´m pretty new to hashcat and this community and I´m needing some help
I´m trying to make a rule to add a plain space after a wordlist in a way i can have a word and some numbers separated by a space.
So instead of having for example the word blah01 I´m looking for blah 01
The question is pretty silly but I didn´t have any success in doing a rule to append a plain space character.
How can i do that? Since I´ve tried $" " and $  with a space after and Hashcat returns a syntax error.
Anybody can help me?

Thanks in advance.