diff --git a/src/main/java/com/ossez/reoc/rets/client/RetsVersion.java b/src/main/java/com/ossez/reoc/rets/client/RetsVersion.java
index 243e69f..189ced5 100644
--- a/src/main/java/com/ossez/reoc/rets/client/RetsVersion.java
+++ b/src/main/java/com/ossez/reoc/rets/client/RetsVersion.java
@@ -5,92 +5,102 @@ import java.io.Serializable;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.math.NumberUtils;
 
+/**
+ * RetsVersion
+ *
+ * @author YuCheng Hu
+ */
 public class RetsVersion implements Serializable {
-	public static final String RETS_VERSION_HEADER = "RETS-Version";
 
-	public static final RetsVersion RETS_10 = new RetsVersion(1, 0, 0, 0);
-	public static final RetsVersion RETS_15 = new RetsVersion(1, 5, 0, 0);
-	public static final RetsVersion RETS_16 = new RetsVersion(1, 6, 0, 0);
-	public static final RetsVersion RETS_17 = new RetsVersion(1, 7, 0, 0);
-	public static final RetsVersion RETS_1_7_2 = new RetsVersion(1, 7, 2, 0);
-	public static final RetsVersion DEFAULT = RETS_1_7_2;
+    public static final String RETS_VERSION_HEADER = "RETS-Version";
 
-	private int mMajor;
-	private int mMinor;
-	private int mRevision;
-	private int mDraft;
+    public static final RetsVersion RETS_10 = new RetsVersion(1, 0, 0, 0);
+    public static final RetsVersion RETS_15 = new RetsVersion(1, 5, 0, 0);
+    public static final RetsVersion RETS_16 = new RetsVersion(1, 6, 0, 0);
+    public static final RetsVersion RETS_17 = new RetsVersion(1, 7, 0, 0);
+    public static final RetsVersion RETS_1_7_2 = new RetsVersion(1, 7, 2, 0);
+    public static final RetsVersion RETS_1_8 = new RetsVersion(1, 8, 0, 0);
+    public static final RetsVersion RETS_1_9 = new RetsVersion(1, 9, 0, 0);
+    public static final RetsVersion DEFAULT = RETS_1_7_2;
 
-	public RetsVersion(int major, int minor) {
-		this(major,minor,0,0);
-	}
-	
-	/** @deprecated use <code>new RetsVersion(major, minor, 0, draft)</code> */
-	@Deprecated
-	public RetsVersion(int major, int minor, int draft) {
-		this(major,minor,0,draft);
-	}
-	
-	public RetsVersion(int major, int minor, int revision, int draft) {
-		this.mMajor = major;
-		this.mMinor = minor;
-		this.mRevision = revision;
-		this.mDraft = draft;
-	}
+    private int mMajor;
+    private int mMinor;
+    private int mRevision;
+    private int mDraft;
 
-	public int getMajor() {
-		return this.mMajor;
-	}
+    public RetsVersion(int major, int minor) {
+        this(major, minor, 0, 0);
+    }
 
-	public int getMinor() {
-		return this.mMinor;
-	}
+    /**
+     * @deprecated use <code>new RetsVersion(major, minor, 0, draft)</code>
+     */
+    @Deprecated
+    public RetsVersion(int major, int minor, int draft) {
+        this(major, minor, 0, draft);
+    }
 
-	public int getRevision() {
-		return this.mRevision;
-	}
-	
-	public int getDraft() {
-		return this.mDraft;
-	}
+    public RetsVersion(int major, int minor, int revision, int draft) {
+        this.mMajor = major;
+        this.mMinor = minor;
+        this.mRevision = revision;
+        this.mDraft = draft;
+    }
 
-	@Override
-	public String toString() {
-		if (this.mRevision == 0) {
-			if (this.mDraft == 0) {
-				return "RETS/" + this.mMajor + "." + this.mMinor;
-			}
-			return "RETS/" + this.mMajor + "." + this.mMinor + "d" + this.mDraft;
-		}
-		if (this.mDraft == 0) {
-			return "RETS/" + this.mMajor + "." + this.mMinor + "." + this.mRevision;
-		}
-		return "RETS/" + this.mMajor + "." + this.mMinor + "." + this.mRevision + "d" + this.mDraft;
-	}
+    public int getMajor() {
+        return this.mMajor;
+    }
 
-	@Override
-	public boolean equals(Object o) {
-		if (o instanceof RetsVersion) {
-			RetsVersion v = (RetsVersion) o;
-			if ((v.getMajor() == this.mMajor) && (v.getMinor() == this.mMinor) && (v.getRevision() == this.mRevision) && (v.getDraft() == this.mDraft)) {
-				return true;
-			}
-		}
-		return false;
-	}
+    public int getMinor() {
+        return this.mMinor;
+    }
+
+    public int getRevision() {
+        return this.mRevision;
+    }
+
+    public int getDraft() {
+        return this.mDraft;
+    }
+
+    @Override
+    public String toString() {
+        if (this.mRevision == 0) {
+            if (this.mDraft == 0) {
+                return "RETS/" + this.mMajor + "." + this.mMinor;
+            }
+            return "RETS/" + this.mMajor + "." + this.mMinor + "d" + this.mDraft;
+        }
+        if (this.mDraft == 0) {
+            return "RETS/" + this.mMajor + "." + this.mMinor + "." + this.mRevision;
+        }
+        return "RETS/" + this.mMajor + "." + this.mMinor + "." + this.mRevision + "d" + this.mDraft;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o instanceof RetsVersion) {
+            RetsVersion v = (RetsVersion) o;
+            if ((v.getMajor() == this.mMajor) && (v.getMinor() == this.mMinor) && (v.getRevision() == this.mRevision) && (v.getDraft() == this.mDraft)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static RetsVersion getVersion(String ver) {
+        if (StringUtils.isEmpty(ver)) return null;
+        String[] split = StringUtils.trimToEmpty(ver).split("\\.");
+        int ma = NumberUtils.toInt(split[0], 1);
+        int mn = split.length > 1 ? NumberUtils.toInt(split[1], 0) : 0;
+        int re = 0;
+        int dr = 0;
+        if (split.length > 2) {
+            split = StringUtils.defaultString(split[2]).split("d");
+            re = NumberUtils.toInt(split[0], 0);
+            dr = split.length > 1 ? NumberUtils.toInt(split[1], 0) : 0;
+        }
+        return new RetsVersion(ma, mn, re, dr);
+    }
 
-	public static RetsVersion getVersion(String ver) {
-		if( StringUtils.isEmpty(ver) ) return null;
-		String[] split = StringUtils.trimToEmpty(ver).split("\\.");
-		int ma = NumberUtils.toInt(split[0],1);
-		int mn = split.length > 1 ? NumberUtils.toInt(split[1],0) : 0;
-		int re = 0;
-		int dr = 0;
-		if (split.length > 2) {
-			split = StringUtils.defaultString(split[2]).split("d");
-			re = NumberUtils.toInt(split[0],0);
-			dr = split.length > 1 ? NumberUtils.toInt(split[1],0) : 0;
-		}
-		return new RetsVersion(ma,mn,re,dr);
-	}
-	
 }