Update the documentation about configure options.

INSTALL

@@ -207,6 +207,15 @@ operates.
 `--disable-reiserfs'
      Omit the ReiserFS support in Stage 2.
 
+`--disable-vstafs'
+     Omit the VSTa filesystem support in Stage 2.
+
+`--disable-jfs'
+     Omit the JFS support in Stage 2.
+
+`--disable-xfs'
+     Omit the XFS support in Stage 2.
+
 `--disable-gunzip'
      Omit the decompression support in Stage 2.
 
@@ -221,6 +230,9 @@ operates.
 `--without-curses'
      Don't use the curses library.
 
+`--disable-hercules'
+     Omit the hercules console support in Stage 2.
+
 `--disable-serial'
      Omit the serial terminal support in Stage 2.
 
@@ -239,6 +251,10 @@ operates.
      Build the example Multiboot kernel in the directory "docs". You
      will be able to boot the image "kernel" with GRUB.
 
+`--disable-auto-linux-mem-opt'
+     Don't pass the "mem=" option automatically, when booting Linux.
+     You can also disable the feature at run time.
+
 
 `configure' also accepts several options for the network support. See
 the file `netboot/README.netboot', for more information.