1 files changed, 3 insertions, 0 deletions
diff --git a/LICENSE b/LICENSE
index b11f379e..bf6a3de1 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,6 @@
 This software is made available under the terms of *either* of the licenses
 found in LICENSE.APACHE or LICENSE.BSD. Contributions to cryptography are made
 under the terms of *both* these licenses.
+
+The code used in the OpenSSL locking callback is derived from the same in
+Python itself, and is licensed under the terms of the PSF License Agreement.