GIRAPH-1192

closes #45
diff --git a/giraph-core/src/main/java/org/apache/giraph/writable/kryo/HadoopKryo.java b/giraph-core/src/main/java/org/apache/giraph/writable/kryo/HadoopKryo.java
index b110101..fb1186b 100644
--- a/giraph-core/src/main/java/org/apache/giraph/writable/kryo/HadoopKryo.java
+++ b/giraph-core/src/main/java/org/apache/giraph/writable/kryo/HadoopKryo.java
@@ -108,7 +108,7 @@
         "it is marked to not allow serialization, " +
         "look at the class for more details");
     NON_SERIALIZABLE.put(
-        KryoWritableWrapper.class, "recursion is dissallowed");
+        KryoWritableWrapper.class, "recursion is disallowed");
     NON_SERIALIZABLE.put(
         Configuration.class,
         "it cannot be supported since it contains ClassLoader");
@@ -172,7 +172,7 @@
 
   /**
    * Read object from the input stream, by reading first type of the object,
-   * and then all of it's fields.
+   * and then all of its fields.
    * Inverse of writeClassAndObject.
    *
    * @param in Input stream
@@ -264,7 +264,7 @@
 
   /**
    * Create copy of the object, by magically recursively copying
-   * all of it's fields, keeping reference structures (like cycles)
+   * all of its fields, keeping reference structures (like cycles)
    *
    * @param object Object to be copied
    * @return Copy of the object.