diff --git a/ChangeLog.md b/ChangeLog.md
index 6c208f1a..ff950c13 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,4 +1,8 @@
-### Version 3.1.0
+### Version 3.2.0
+
+* Fixed PolyBlockType definition - [Issue #280](https://github.com/charlesw/tesseract/issues/280)
+
+### Version 3.1.0
 
 * Support for printing list of available variables - [Issue 256](https://github.com/charlesw/tesseract/issues/256)
 * Support for line removal - [Issue 268](https://github.com/charlesw/tesseract/issues/256)
diff --git a/src/Tesseract/PolyBlockType.cs b/src/Tesseract/PolyBlockType.cs
index c08e7a9a..be4dc3e8 100644
--- a/src/Tesseract/PolyBlockType.cs
+++ b/src/Tesseract/PolyBlockType.cs
@@ -6,18 +6,59 @@ namespace Tesseract
 {
     public enum PolyBlockType : int
     {
+        /// <summary>
+        /// The type is not known yet, keep as first element.
+        /// </summary>
         Unknown,
+        /// <summary>
+        /// The text is inside a column.
+        /// </summary>
         FlowingText,
+        /// <summary>
+        /// The text spans more than one column.
+        /// </summary>
         HeadingText,
+        /// <summary>
+        /// The text is in a cross-column pull-out region.
+        /// </summary>
         PullOutText,
+        /// <summary>
+        /// The partion belongs to an equation region..
+        /// </summary>
+        Equation,
+        /// <summary>
+        /// The partion has an inline equation.
+        /// </summary>
+        InlineEquation,
+        /// <summary>
+        /// The partion belongs to a Table region.
+        /// </summary>
         Table,
+        /// <summary>
+        /// Text line runs vertically.
+        /// </summary>
         VerticalText,
+        /// <summary>
+        /// Text that belongs to an image.
+        /// </summary>
         CaptionText,
+        /// <summary>
+        /// Image that lives inside a column.
+        /// </summary>
         FlowingImage, 
+        /// <summary>
+        /// Image that spans more than one column.
+        /// </summary>
         HeadingImage,
+        /// <summary>
+        /// Image that is in a cross-column pull-out region.
+        /// </summary>
         PullOutImage,
         HorizontalLine, 
         VerticalLine,
+        /// <summary>
+        /// Lies outside any column.
+        /// </summary>
         Noise,
         Count
     }