Fix previous change.

INSTALL

@@ -507,12 +507,16 @@ Installation on MSDOG (a.k.a. MSDOS)
 To install on MSDOG, you need to have the GNU C compiler for MSDOG
 (also known as djgpp), GNU Make, rm, mv, chmod, and sed.
 
-Some users report that running Emacs 19.29 requires qdpmi memory
+Some users report that running Emacs 19.29 requires dpmi memory
 management.  We do not know why this is so, since 19.28 did not need
 it.  If we find out what change introduced this requirement, we will
 try to eliminate it.  It is possible that this problem happens only
 when there is not enough physical memory on the machine.
 
+You can find out if you have a dpmi host by running go32 (part of
+djgpp) without arguments; it will tell you if it uses dpmi memory.
+For more information about dpmi memory, consult the djgpp FAQ.
+
 To build and install Emacs, type these commands:
 
     config msdos