diff --git a/README.md b/README.md
index 19f3531..590eaeb 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,8 @@ myGeoTableManager.putPoint({
             Item: { // The primary key, geohash and geojson data is filled in for you
                 country: { S: 'UK' }, // Specify attribute values using { type: value } objects, like the DynamoDB API.
                 capital: { S: 'London' }
-            }
+            },
+            // ... Anything else to pass through to `putItem`, eg ConditionExpression
         }
     }).promise()
     .then(function() { console.log('Done!') });
diff --git a/src/dynamodb/DynamoDBManager.ts b/src/dynamodb/DynamoDBManager.ts
index 57903a1..8d1bf06 100644
--- a/src/dynamodb/DynamoDBManager.ts
+++ b/src/dynamodb/DynamoDBManager.ts
@@ -109,9 +109,10 @@ export class DynamoDBManager {
     const geohash = S2Manager.generateGeohash(putPointInput.GeoPoint);
     const hashKey = S2Manager.generateHashKey(geohash, this.config.hashKeyLength);
     const putItemInput: PutItemInput = {
+      ...putPointInput.PutItemInput,
       TableName: this.config.tableName,
       Item: putPointInput.PutItemInput.Item || {}
-    }
+    };
 
     putItemInput.Item[this.config.hashKeyAttributeName] = { N: hashKey.toString(10) };
     putItemInput.Item[this.config.rangeKeyAttributeName] = putPointInput.RangeKeyValue;
diff --git a/test/dynamodb/DynamoDBManager.ts b/test/dynamodb/DynamoDBManager.ts
index 2c31fe6..a8443ce 100644
--- a/test/dynamodb/DynamoDBManager.ts
+++ b/test/dynamodb/DynamoDBManager.ts
@@ -12,7 +12,7 @@ describe('DynamoDBManager.deletePoint', () => {
             TableName: 'MyTable',
             Key: {
               hashKey: { N: '44' },
-              rangeKey: 'myRangeKey'
+              rangeKey: { S: '1234' }
             }
           }
         );
@@ -22,7 +22,7 @@ describe('DynamoDBManager.deletePoint', () => {
     const ddb = new DynamoDBManager(config);
 
     ddb.deletePoint({
-      RangeKeyValue: 'myRangeKey',
+      RangeKeyValue: { S: '1234' },
       GeoPoint: {
         longitude: 50,
         latitude: 1
@@ -32,3 +32,46 @@ describe('DynamoDBManager.deletePoint', () => {
     expect(called).to.be.true;
   });
 });
+
+describe('DynamoDBManager.putPoint', () => {
+  it('calls putItem with the correct arguments ', () => {
+    let called = false;
+    const config = new GeoDataManagerConfiguration({
+      putItem: (args: any) => {
+        called = true;
+        expect(args).to.deep.equal({
+            TableName: 'MyTable',
+            Item: {
+              geoJson: { S: "{\"type\":\"POINT\",\"coordinates\":[-0.13,51.51]}" },
+              geohash: { N: "5221366118452580119" },
+              hashKey: { N: "52" },
+              rangeKey: { S: "1234" },
+              country: { S: 'UK' },
+              capital: { S: 'London' }
+            },
+            ConditionExpression: "attribute_not_exists(capital)"
+          }
+        );
+      }
+    }, 'MyTable');
+
+    const ddb: any = new DynamoDBManager(config);
+
+    ddb.putPoint({
+      RangeKeyValue: { S: '1234' }, // Use this to ensure uniqueness of the hash/range pairs.
+      GeoPoint: { // An object specifying latitutde and longitude as plain numbers. Used to build the geohash, the hashkey and geojson data
+        latitude: 51.51,
+        longitude: -0.13
+      },
+      PutItemInput: { // Passed through to the underlying DynamoDB.putItem request. TableName is filled in for you.
+        Item: { // The primary key, geohash and geojson data is filled in for you
+          country: { S: 'UK' }, // Specify attribute values using { type: value } objects, like the DynamoDB API.
+          capital: { S: 'London' }
+        },
+        ConditionExpression: "attribute_not_exists(capital)"
+      }
+    });
+
+    expect(called).to.be.true;
+  });
+});