diff --git a/Source/DotSpatial.NTSExtension/FloatVector3.cs b/Source/DotSpatial.NTSExtension/FloatVector3.cs
index f14131fec..b3864135e 100644
--- a/Source/DotSpatial.NTSExtension/FloatVector3.cs
+++ b/Source/DotSpatial.NTSExtension/FloatVector3.cs
@@ -23,6 +23,9 @@
 
 namespace DotSpatial.NTSExtension
 {
+    /// <summary>
+    /// A float based 3 dimensional vector class, implementing all interesting features of vectors.
+    /// </summary>
     public struct FloatVector3
     {
         #region Fields
diff --git a/Source/DotSpatial.Symbology/FeatureLayer.cs b/Source/DotSpatial.Symbology/FeatureLayer.cs
index 2ebcc9fe8..fd6341ea6 100644
--- a/Source/DotSpatial.Symbology/FeatureLayer.cs
+++ b/Source/DotSpatial.Symbology/FeatureLayer.cs
@@ -2156,6 +2156,10 @@ private void LabelSetupClick(object sender, EventArgs e)
 
         #endregion
 
+        /// <summary>
+        /// Disposes the resources of the FeatureLayer.
+        /// </summary>
+        /// <param name="disposeManagedResources">Indicates whether managed resources should be disposed too.</param>
         protected override void Dispose(bool disposeManagedResources)
         {
             if (disposeManagedResources)
diff --git a/Source/DotSpatial.Symbology/FeatureLayerExt.cs b/Source/DotSpatial.Symbology/FeatureLayerExt.cs
index 0fca7d507..87503ba88 100644
--- a/Source/DotSpatial.Symbology/FeatureLayerExt.cs
+++ b/Source/DotSpatial.Symbology/FeatureLayerExt.cs
@@ -22,14 +22,17 @@
 
 namespace DotSpatial.Symbology
 {
+    /// <summary>
+    /// Extension methods for DotSpatial.Symbology.IFeatureLayer.
+    /// </summary>
     public static class FeatureLayerExt
     {
         #region Methods
 
         /// <summary>
-        /// Inverts the selection
+        /// Inverts the selection.
         /// </summary>
-        /// <param name="featureLayer"></param>
+        /// <param name="featureLayer">IFeatureLayer whose selection is inverted.</param>
         public static void InvertSelection(this IFeatureLayer featureLayer)
         {
             Envelope ignoreMe;
diff --git a/Source/DotSpatial.Symbology/LabelCategory.cs b/Source/DotSpatial.Symbology/LabelCategory.cs
index 185116f00..f45fc9a3e 100644
--- a/Source/DotSpatial.Symbology/LabelCategory.cs
+++ b/Source/DotSpatial.Symbology/LabelCategory.cs
@@ -44,7 +44,7 @@ public class LabelCategory : ILabelCategory
         private ILabelSymbolizer _symbolizer;
 
 
-        private Expression _exp;
+        private readonly Expression _exp;
 
         #endregion
 
@@ -94,6 +94,10 @@ public virtual LabelCategory Copy()
             return result;
         }
 
+        /// <summary>
+        /// Returns the categories name or "No Name" if the name is not set.
+        /// </summary>
+        /// <returns>The categories name or "No Name" if the name is not set.</returns>
         public override string ToString()
         {
             return string.IsNullOrEmpty(Name) ? "<No Name>" : Name;
@@ -114,14 +118,14 @@ public bool UpdateExpressionColumns(DataColumnCollection columns)
         /// </summary>
         /// <param name="row">Datarow the expression gets calculated for.</param>
         /// <param name="selected">Indicates whether the feature is selected.</param>
-        /// <param name="FID">The FID of the feature, the expression gets calculated for.</param>
+        /// <param name="fid">The FID of the feature, the expression gets calculated for.</param>
         /// <returns>null if there was an error while parsing the expression, else the calculated expression</returns>
-        public string CalculateExpression(DataRow row, bool selected, int FID)
+        public string CalculateExpression(DataRow row, bool selected, int fid)
         {
             string ff = (selected ? _selectionSymbolizer : _symbolizer).FloatingFormat;
             _exp.FloatingFormat = ff != null ? ff.Trim() : "";
             _exp.ParseExpression(_expression);
-            return _exp.CalculateRowValue(row, FID);
+            return _exp.CalculateRowValue(row, fid);
         }
 
         #endregion
diff --git a/Source/DotSpatial.Symbology/Selection.cs b/Source/DotSpatial.Symbology/Selection.cs
index 088162d4d..2052c5c3b 100644
--- a/Source/DotSpatial.Symbology/Selection.cs
+++ b/Source/DotSpatial.Symbology/Selection.cs
@@ -22,12 +22,15 @@
 
 namespace DotSpatial.Symbology
 {
+    /// <summary>
+    /// Selection is used to remember all the selected features of the corresponding IFeatureSet.
+    /// </summary>
     public class Selection : FeatureSelection
     {
         #region Constructors
 
         /// <summary>
-        /// Creates a new instance of Selection
+        /// Creates a new instance of Selection.
         /// </summary>
         public Selection(IFeatureSet fs, IDrawingFilter inFilter)
             : base(fs, inFilter, FilterType.Selection)