diff --git a/csrc/libmysql/WHAT b/csrc/libmysql/WHAT
new file mode 100644
index 0000000..abb61f5
--- /dev/null
+++ b/csrc/libmysql/WHAT
@@ -0,0 +1,5 @@
+libmysql wasn't build from source.
+
+insead, libmysql.dll 6.1.0.0 was used.
+
+no binary for linux is included.