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-rw-r--r--docs/hazmat/backends/interfaces.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index ca3a5433..5b3e852a 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -163,7 +163,9 @@ A specific ``backend`` may provide one or more of these interfaces.
:param bytes salt: A salt.
:param int iterations: The number of iterations to perform of the hash
- function.
+ function. This can be used to control the length of time the
+ operation takes. Higher numbers help mitigate brute force attacks
+ against derived keys.
:param bytes key_material: The key material to use as a basis for
the derived key. This is typically a password.