diff --git a/docs/INSTALL b/docs/INSTALL
index 1f8131af2740482c27d243201d5beb2e4f49fa44..6f15db460b6814c18153e16275e54e63fe297c15 100644
--- a/docs/INSTALL
+++ b/docs/INSTALL
@@ -254,7 +254,7 @@ PORTS
    This is a probably incomplete list of known hardware and
    operating systems that curl has been compiled for:
 
-        - Ultrix
+        - Ultrix 4.3a
         - SINIX-Z v5
         - Alpha DEC OSF 4
         - Alpha Digital UNIX v3.2