diff --git a/docs/INSTALL b/docs/INSTALL
index 97c35319cd..d4fd259c92 100644
--- a/docs/INSTALL
+++ b/docs/INSTALL
@@ -411,7 +411,7 @@ PORTS
         - MIPS IRIX 6.2, 6.5
         - MIPS Linux
         - Pocket PC/Win CE 3.0
-        - Power AIX 4.2, 4.3.1, 4.3.2
+        - Power AIX 4.2, 4.3.1, 4.3.2, 5.1
         - PowerPC Darwin 1.0
         - PowerPC Linux
         - PowerPC Mac OS 9