Brewfile: say why bash is here, correctly

The reason given named bin/open, which does not need it: on macOS it execs
/usr/bin/open on line 13, before anything 3.2 cannot parse. What does need it
is szecret's age bootstrap -- `${os,,}` in secrets/common.sh, reached only when
age is absent, which is precisely the state a machine is in before this file
has been applied.

1 files changed, 4 insertions, 3 deletions

diff --git a/Brewfile b/Brewfile
index 5a87219..dc82909 100644
--- a/Brewfile
+++ b/Brewfile
@@ -5,9 +5,10 @@
 # with `brew bundle`, which only adds.
 
 # Something breaks without these.
-brew "bash"                # bin/open and secrets/ use bash 4 syntax (${v,,});
-                           # macOS ships 3.2, and config/bashrc looks for the
-                           # bash-completion 2.x that needs 4.2
+brew "bash"                # macOS ships 3.2. szecret's fallback that fetches
+                           # age -- the path taken before this file is applied
+                           # -- dies there on `${os,,}`, and config/bashrc
+                           # looks for the bash-completion 2.x that needs 4.2
 brew "tmux"                # both terminals start every window in tmux
 brew "neovim"              # the editor; vi, vim and git all call nvim
 brew "age"                 # szecret