Mention default PREFIX value in README

diff --git a/README.md b/README.md
index b6cb42e..daf8ff8 100644 (file)
--- a/README.md
+++ b/README.md
@@ -31,7 +31,8 @@ instructions
 - Debian: `apt install racket`
 
 ### installation
-`make build && make install` will build and copy `tt` binary into `$PREFIX/bin`.
+`make build && make install` will build and copy `tt` binary into
+`$PREFIX/bin`, where `$PREFIX` defaults to `$HOME`.
 
 ### configuration
 Put your `<nick>` and `<uri>` into `~/.tt/me`. For example, mine is: