diff --git a/README.GNO b/README.GNO
index 138850e..bc3ce87 100644
--- a/README.GNO
+++ b/README.GNO
@@ -1,12 +1,12 @@
 This is an updated version of the ORCALib library suitable for use with
 GNO 2.0.6.  For those library functions that it implements, it contains
 the same updates and fixes as the standard version of ORCALib included
-with ORCA/C 2.2.0 B4.  However, under GNO, some portions of the C standard
+with ORCA/C 2.2.0 B5.  However, under GNO, some portions of the C standard
 library are implemented by GNO's libc rather than by ORCALib, and so
 updating ORCALib will not affect those library functions.  This applies
 to all of <stdio.h>, as well as to certain other functions.
 
-This library update is intended for use with ORCA/C 2.2.0 B4, but it
+This library update is intended for use with ORCA/C 2.2.0 B5, but it
 should also be compatible with ORCA/C versions back to 2.1.
 
 To install the update, copy the new version of ORCALib into the /lib