diff --git a/lib/moped/session.rb b/lib/moped/session.rb
index 54203fa..e7b52ab 100644
--- a/lib/moped/session.rb
+++ b/lib/moped/session.rb
@@ -172,12 +172,26 @@ def logout
     # Setup validation of allowed write concern options.
     #
     # @since 2.0.0
-    option(:write).allow({ w: Optionable.any(Integer) }, { "w" => Optionable.any(Integer) })
-    option(:write).allow({ w: Optionable.any(String) }, { "w" => Optionable.any(String) })
-    option(:write).allow({ j: true }, { "j" => true })
-    option(:write).allow({ j: false }, { "j" => false })
-    option(:write).allow({ fsync: true }, { "fsync" => true })
-    option(:write).allow({ fsync: false }, { "fsync" => false })
+    option(:write).allow(Optionable.any(Hash))
+
+    class WriteOption
+      include Optionable
+
+      option(:w).allow(Optionable.any(Integer))
+      option('w').allow(Optionable.any(Integer))
+      option(:w).allow(Optionable.any(String))
+      option('w').allow(Optionable.any(String))
+      option(:j).allow(true, false)
+      option('j').allow(true, false)
+      option(:fsync).allow(true, false)
+      option('fsync').allow(true, false)
+      option(:wtimeout).allow(Optionable.any(Integer))
+      option('wtimeout').allow(Optionable.any(Integer))
+
+      def initialize(opts)
+        validate_strict(opts)
+      end
+    end
 
     # Setup validation of allowed read preference options.
     #
@@ -263,6 +277,7 @@ def logout
     # @since 1.0.0
     def initialize(seeds, options = {})
       validate_strict(options)
+      WriteOption.new(options[:write])
       @options = options
       @cluster = Cluster.new(seeds, options)
     end
diff --git a/lib/moped/write_concern/propagate.rb b/lib/moped/write_concern/propagate.rb
index 6d181d1..e76ea2a 100644
--- a/lib/moped/write_concern/propagate.rb
+++ b/lib/moped/write_concern/propagate.rb
@@ -29,7 +29,7 @@ def initialize(options)
       def normalize(options)
         opts = {}
         options.each do |key, value|
-          opts[key] = value.is_a?(Symbol) ? value.to_s : value
+          opts[key.to_sym] = value.is_a?(Symbol) ? value.to_s : value
         end
         opts
       end
diff --git a/spec/moped/session_spec.rb b/spec/moped/session_spec.rb
index 6d4005f..8094f35 100644
--- a/spec/moped/session_spec.rb
+++ b/spec/moped/session_spec.rb
@@ -315,6 +315,29 @@
           expect(unverified.write_concern).to be_a(Moped::WriteConcern::Unverified)
         end
       end
+
+      context "when the value is an integer" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { w: 1 })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+        end
+      end
+
+      context "when the value is an string" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { w: "majority" })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:w]).to eq('majority')
+        end
+      end
     end
 
     context "when no write option is provided" do
@@ -327,6 +350,87 @@
         expect(propagate.write_concern).to be_a(Moped::WriteConcern::Propagate)
       end
     end
+
+    context "when a timeout option is provided" do
+
+      context "when the option is a symbol" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { wtimeout: 10000 })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:wtimeout]).to eq(10000)
+        end
+      end
+
+      context "when the option is a string" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { 'wtimeout' => 10000 })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:wtimeout]).to eq(10000)
+        end
+      end
+    end
+
+    context "when a journal option is provided" do
+
+      context "when the option is a symbol" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { j: true })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:j]).to eq(true)
+        end
+      end
+
+      context "when the option is a string" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { 'j' => true })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:j]).to eq(true)
+        end
+      end
+    end
+
+    context "when an fsync option is provided" do
+
+      context "when the option is a symbol" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { fsync: true })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:fsync]).to eq(true)
+        end
+      end
+
+      context "when the option is a string" do
+
+        let(:verified) do
+          described_class.new([ "127.0.0.1:27017" ], write: { 'fsync' => true })
+        end
+
+        it "returns the corresponding write concern" do
+          expect(verified.write_concern).to be_a(Moped::WriteConcern::Propagate)
+          expect(verified.write_concern.operation[:fsync]).to eq(true)
+        end
+      end
+    end
   end
 
   context "when attempting to connect to a node that does not exist" do