This directory (msvc) serves as a central location for
all things needed to build the mono runtime using
-Microsoft Visual Studio.
\ No newline at end of file
+Microsoft Visual Studio.
+
+When new exported API calls are added to the runtime, issue the
+command:
+ make update-def
+in this directory and commit the resulting mono.def file.
+This must happen on a Linux system, because we get the list
+of the exported symbols from the generated shared library.
+