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-rw-r--r--unsupported/Eigen/AutoDiff3
1 files changed, 3 insertions, 0 deletions
diff --git a/unsupported/Eigen/AutoDiff b/unsupported/Eigen/AutoDiff
index 2bf8de6f6..c6f6ba0b2 100644
--- a/unsupported/Eigen/AutoDiff
+++ b/unsupported/Eigen/AutoDiff
@@ -35,6 +35,9 @@ namespace Eigen {
* This module features forward automatic differentation via a simple
* templated scalar type wrapper AutoDiffScalar.
*
+ * Warning : this should NOT be confused with numerical differentiation, which
+ * is a different method and has its own module in Eigen.
+ *
* \code
* #include <unsupported/Eigen/AutoDiff>
* \endcode