diff --git a/README.md b/README.md
index cd709c0..be96037 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,7 @@ Dependencies
 Bdb
 ---
 
-Your need first this library:
-
-http://github.com/DenisKnauf/bdb
+You need first the [Bdb](http://github.com/DenisKnauf/bdb) and of course ruby.
 
 Download
 ========
diff --git a/Rakefile b/Rakefile
index 831e1dc..309efe5 100644
--- a/Rakefile
+++ b/Rakefile
@@ -10,7 +10,7 @@ begin
     gem.email = "Denis.Knauf@gmail.com"
     gem.homepage = "http://github.com/DenisKnauf/bdb"
     gem.authors = ["Denis Knauf"]
-    gem.files = ["README", "VERSION", "lib/**/*.rb", "test/**/*.rb"]
+    gem.files = ["README.md", "VERSION", "lib/**/*.rb", "test/**/*.rb"]
     gem.require_paths = ["lib"]
 		gem.add_dependency 'bdb'
   end
diff --git a/lib/sbdb/db.rb b/lib/sbdb/db.rb
index 33626d9..dc6fb4f 100644
--- a/lib/sbdb/db.rb
+++ b/lib/sbdb/db.rb
@@ -117,7 +117,7 @@ module SBDB
 		end
 
 		def unshift
-			@db.get nil, nil, nil, Bdb::DB_CONSUME
+			@db.get nil, "\0\0\0\0", nil, Bdb::DB_CONSUME
 		end
 
 		def push v
diff --git a/sbdb.gemspec b/sbdb.gemspec
index 43028bf..11e2da4 100644
--- a/sbdb.gemspec
+++ b/sbdb.gemspec
@@ -14,10 +14,10 @@ Gem::Specification.new do |s|
   s.email = %q{Denis.Knauf@gmail.com}
   s.extra_rdoc_files = [
     "LICENSE",
-     "README"
+     "README.md"
   ]
   s.files = [
-    "README",
+    "README.md",
      "VERSION",
      "lib/sbdb.rb",
      "lib/sbdb/cursor.rb",