diff --git a/src/sodium/lib_sodium.cr b/src/sodium/lib_sodium.cr
index d782f36..ad27abb 100644
--- a/src/sodium/lib_sodium.cr
+++ b/src/sodium/lib_sodium.cr
@@ -36,6 +36,7 @@ module Sodium
     fun crypto_pwhash_saltbytes : LibC::SizeT
     fun crypto_pwhash_bytes_min : LibC::SizeT
     fun crypto_pwhash_bytes_max : LibC::SizeT
+    fun crypto_pwhash_alg_default : LibC::Int
     fun crypto_generichash_blake2b_statebytes : LibC::SizeT
     fun crypto_generichash_blake2b_bytes : LibC::SizeT
     fun crypto_generichash_blake2b_bytes_min : LibC::SizeT
diff --git a/src/sodium/pwhash.cr b/src/sodium/pwhash.cr
index ff011e1..27b2e6d 100644
--- a/src/sodium/pwhash.cr
+++ b/src/sodium/pwhash.cr
@@ -29,6 +29,11 @@ module Sodium
     enum Mode
       Argon2i13  = 1
       Argon2id13 = 2
+
+      # The current libsodium default algorithm that may change between versions.
+      def default
+        Mode.new LibSodium.crypto_pwhash_alg_default
+      end
     end
 
     property opslimit = OPSLIMIT_INTERACTIVE
diff --git a/src/sodium/secure_buffer.cr b/src/sodium/secure_buffer.cr
index ded73a8..859342b 100644
--- a/src/sodium/secure_buffer.cr
+++ b/src/sodium/secure_buffer.cr
@@ -82,10 +82,12 @@ module Sodium
       self
     end
 
+    # Timing safe memory compare.
     def ==(other : self)
       Sodium.memcmp self.to_slice, other.to_slice
     end
 
+    # Timing safe memory compare.
     def ==(other : Bytes)
       Sodium.memcmp self.to_slice, other
     end