diff --git a/src/mzscheme/src/schvers.h b/src/mzscheme/src/schvers.h
index fdced040cd..e7bc90ad8e 100644
--- a/src/mzscheme/src/schvers.h
+++ b/src/mzscheme/src/schvers.h
@@ -4,7 +4,7 @@
       X.Y.Z     Z != 0
       X.Y.Z.W   W != 0
    where each X, Y, Z, W is a non-negative exact integer, Y must not
-   exceed 99, and Z must not exceed 999.  Y>=90 means that this is
+   exceed 99, and Z or W must not exceed 999.  Y>=90 means that this is
    working towards {X+1}.0, and X.Y (Z=0, W=0) is an alpha version for
    {X+1}.0; Z>=900 means working towards X.{Y+1}, and X.Y.Z as an
    alpha release.