diff --git a/README.md b/README.md
index 2085bb3..4267c62 100644
--- a/README.md
+++ b/README.md
@@ -174,7 +174,7 @@ class MySecret
     # optionally mlock
   end
 
-  def to_slice(& : Bytes -> Nil)
+  protected def to_slice(& : Bytes -> Nil)
     # The yielded Slice only needs to be valid within the block
     # yield Slice.new(pointer, size)
   ensure
diff --git a/src/crypto-secret/bidet.cr b/src/crypto-secret/bidet.cr
index d035187..a582f5d 100644
--- a/src/crypto-secret/bidet.cr
+++ b/src/crypto-secret/bidet.cr
@@ -6,6 +6,7 @@ module Crypto::Secret
   # * Not locked in memory
   # * Not access protected
   # * No guard pages
+  # * Hours of fun
   class Bidet
     include Stateless
 
diff --git a/src/crypto-secret/secret.cr b/src/crypto-secret/secret.cr
index f6b21c1..8fe9bd4 100644
--- a/src/crypto-secret/secret.cr
+++ b/src/crypto-secret/secret.cr
@@ -90,7 +90,7 @@ module Crypto::Secret
   abstract def readonly
   abstract def noaccess
 
-  abstract def to_slice(& : Bytes -> Nil)
+  protected abstract def to_slice(& : Bytes -> Nil)
   abstract def bytesize : Int32
 
   macro delegate_to_slice(to object)