Confusion with environment variables for /usr/local/bin/zsh

% grep nano ~/.profile
EDITOR=/usr/local/bin/nano;     export EDITOR
VISUAL=/usr/local/bin/nano;     export VISUAL
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% cat /usr/share/games/fortune/freebsd-tips | grep -B 1 -A 5 variables
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You can permanently set environment variables for your shell by putting them
in a startup file for the shell.  The name of the startup file varies
depending on the shell - csh and tcsh uses .login, bash, sh, ksh and zsh use
.profile.  When using bash, sh, ksh or zsh, don't forget to export the
variable.
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