diff --git a/BUILDING.md b/BUILDING.md
index 89d69b8229830a..eb68b22370d87d 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -40,8 +40,8 @@ Support is divided into three tiers:
 | Windows      | Tier 1       | >= Windows 7 or >= Windows2008R2 | x86, x64             |                  |
 | 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              |                  |
-| AIX          | Tier 2       | >= 7.1 TL04                      | ppc64be              |                  |
+| 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                |                  |
 | macOS        | Experimental | >= 10.8 < 10.10                  | x64                  | no test coverage |
 | Linux (musl) | Experimental | musl >= 1.0                      | x64                  |                  |