Update 2024-02-15-Windows-7.md

Author: ChrisDenton

posts/2024-02-15-Windows-7.md

@@ -8,7 +8,9 @@ The minimum requirements for tier 1 toolchains targeting Windows will increase w
 Windows 10 will now be the minimum supported version.
 These requirements apply both to running the Rust compiler itself and to running binaries produced by Rust, if they use the libstd.
 
-Additionally there are two new tier 3 targets that have Windows 7 as their baseline: `x86_64-win7-windows-msvc` and `i686-win7-windows-msvc`.
+Additionally there are two new targets that have Windows 7 as their baseline: `x86_64-win7-windows-msvc` and `i686-win7-windows-msvc`.
+They are starting as tier 3 targets, meaning that the Rust codebase has support for them but we don't build or test them automatically.
+Therefore binaries aren't distributed via rustup.
 
 ## Affected targets