elaborate on always syntax unresolved q

Author: davidtwco

text/0000-build-std/4-build-std-always.md

@@ -1219,6 +1219,10 @@ What should this configuration option be named? `build-std`?
 What is the most intuitive name for the values of the `build-std` setting?
 `always`? `manual`? `unconditional`?
 
+`always` is an imperfect name as it implies the standard library will be
+re-built every time, when it actually just avoids use of the pre-built standard
+library and caches the newly-built standard library.
+
 ↩ [*Proposal*][proposal]
 
 ## What should `build-std-crates` be named?