documentation improvements for KDF
diff --git a/docs/hazmat/primitives/index.rst b/docs/hazmat/primitives/index.rst
index 2a29bd8..bde0739 100644
--- a/docs/hazmat/primitives/index.rst
+++ b/docs/hazmat/primitives/index.rst
@@ -9,7 +9,7 @@
     cryptographic-hashes
     hmac
     symmetric-encryption
-    key-derivation-functions
     padding
+    key-derivation-functions
     constant-time
     interfaces