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diff --git a/README b/README
index 95c11bb..df4d75a 100644
--- a/README
+++ b/README
@@ -1 +1,5 @@
 w32lib: custom import libraries for OS user-space interfaces
+
+# manual generation of .def source files:
+# make -f project/w32def/w32def.mk W32_SYSDIR=/path/to/Windows/System32 w32def
+# adjust the value of W32_SYSDIR as needed.