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diff --git a/m4/README b/m4/README
index f5f4656b24a0..1653fc57c57e 100644
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@@ -1,3 +1,5 @@
m4 - Macros to locate and utilise pkg-config.
-work around m4 bracket stripping in MINGWSTRIP construction \ No newline at end of file
+The ax_*.m4 files are from GNU autoconf-archive, http://www.gnu.org/software/autoconf-archive/
+
+work around m4 bracket stripping in MINGWSTRIP construction