diff --git a/doc/TIERS.md b/doc/TIERS.md
index 4be4fd6..c546bea 100644
--- a/doc/TIERS.md
+++ b/doc/TIERS.md
@@ -15,3 +15,4 @@ Tier 3 backends are:
 
 - Mac OS X 10.4+ with Cocoa
 - Mac OS 7-9, PowerPC (68k support not planned).
+- Haiku
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