diff --git a/docs/msw/install.md b/docs/msw/install.md
index 1c70494833..eef51a59b7 100644
--- a/docs/msw/install.md
+++ b/docs/msw/install.md
@@ -84,11 +84,13 @@ Microsoft Visual C++ Compilation       {#msw_build_msvs}
 
    to build a release version or
 
-        > nmake /f makefile.vc BUILD=release SHARED=1
+        > nmake /f makefile.vc BUILD=release SHARED=1 TARGET_CPU=X86
 
-   to build a release DLL version. Finally, you can also add
-   `TARGET_CPU=X64` to nmake command line to build Win64 versions
-   (this only works if you are using a 64 bit compiler, of course).
+   to build a 32 bit release DLL version from an x86 command prompt, or
+
+        > nmake /f makefile.vc BUILD=release SHARED=1 TARGET_CPU=X64
+
+   to build a 64 bit release DLL version from an x64 command prompt.
 
    See "Configuring the Build" for more information about the
    additional parameters that can be specified on the command line.