diff --git a/BUILDING.md b/BUILDING.md
index 47630ddf150216..fa2198bc110dee 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -43,10 +43,10 @@ in production.
 | macOS        | Tier 1       | >= 10.10                         | x64                  |                  |
 | Windows      | Tier 1       | >= Windows 7 / 2008 R2           | x86, x64             | vs2015 or vs2017 |
 | SmartOS      | Tier 2       | >= 15 < 16.4                     | x86, x64             | see note1        |
-| FreeBSD      | Tier 2       | >= 10                            | x64                  |                  |
 | GNU/Linux    | Tier 2       | kernel >= 3.13.0, glibc >= 2.19  | ppc64le >=power8     |                  |
 | AIX          | Tier 2       | >= 7.1 TL04                      | ppc64be >=power7     |                  |
 | GNU/Linux    | Tier 2       | kernel >= 3.10, glibc >= 2.17    | s390x                |                  |
+| FreeBSD      | Experimental | >= 10                            | x64                  |                  |
 | macOS        | Experimental | >= 10.8 < 10.10                  | x64                  | no test coverage |
 | Linux (musl) | Experimental | musl >= 1.0                      | x64                  |                  |