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-rw-r--r--unsupported/Eigen/MPRealSupport2
1 files changed, 2 insertions, 0 deletions
diff --git a/unsupported/Eigen/MPRealSupport b/unsupported/Eigen/MPRealSupport
index de4f11934..35d77e5bd 100644
--- a/unsupported/Eigen/MPRealSupport
+++ b/unsupported/Eigen/MPRealSupport
@@ -27,6 +27,8 @@ namespace Eigen {
* via the <a href="http://www.holoborodko.com/pavel/mpfr">MPFR C++</a>
* library which itself is built upon <a href="http://www.mpfr.org/">MPFR</a>/<a href="http://gmplib.org/">GMP</a>.
*
+ * \warning MPFR C++ is licensed under the GPL.
+ *
* You can find a copy of MPFR C++ that is known to be compatible in the unsupported/test/mpreal folder.
*
* Here is an example: