diff --git a/doc/about.md b/doc/about.md
index f3fb0b2..5796f89 100644
--- a/doc/about.md
+++ b/doc/about.md
@@ -16,4 +16,4 @@ This work is supported by the Laboratory Directed Research and Development (LDRD
 * Rui Yao, Feng Qiu, Kai Sun, “Contingency Analysis Based on Partitioned and Parallel Holomorphic Embedding”, IEEE Transactions on Power Systems, in press.
 
 ### License
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+This software is under BSD license. Please refer to LICENSE.md for details.
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