diff --git a/PluginCommon/Interfaces.cs b/PluginCommon/Interfaces.cs
index 832cac3..9fa19e6 100644
--- a/PluginCommon/Interfaces.cs
+++ b/PluginCommon/Interfaces.cs
@@ -323,7 +323,8 @@ namespace PluginCommon {
         /// Will be null for direct-color images.  Do not modify.
         /// </summary>
         /// <remarks>
-        /// It's possible, but weird, for the array to have a length of zero.
+        /// It's possible, but weird, for the array to have a length of zero.  For best results
+        /// with GIF images, only one palette entry should be transparent.
         /// </remarks>
         int[] GetPalette();
 
diff --git a/PluginCommon/VisBitmap8.cs b/PluginCommon/VisBitmap8.cs
index d9ee6d9..491cd4e 100644
--- a/PluginCommon/VisBitmap8.cs
+++ b/PluginCommon/VisBitmap8.cs
@@ -64,6 +64,12 @@ namespace PluginCommon {
             return mPalette[pix];
         }
 
+        /// <summary>
+        /// Gets the color index for a single pixel.
+        /// </summary>
+        /// <param name="x">X coordinate.</param>
+        /// <param name="y">Y coordinate.</param>
+        /// <returns>Color index.</returns>
         public byte GetPixelIndex(int x, int y) {
             return mData[x + y * Width];
         }
diff --git a/SourceGen/AppSettings.cs b/SourceGen/AppSettings.cs
index a2d1331..afe97ef 100644
--- a/SourceGen/AppSettings.cs
+++ b/SourceGen/AppSettings.cs
@@ -187,6 +187,7 @@ namespace SourceGen {
         /// </summary>
         /// <returns></returns>
         public AppSettings GetCopy() {
+            // TODO: make this a copy constructor?
             AppSettings copy = new AppSettings();
             //copy.mSettings.EnsureCapacity(mSettings.Count);
             foreach (KeyValuePair<string, string> kvp in mSettings) {
@@ -202,7 +203,7 @@ namespace SourceGen {
         /// discarding the object itself, which is useful in case something has cached a
         /// reference to the singleton.
         /// </summary>
-        /// <param name="newSettings"></param>
+        /// <param name="newSettings">Object with new settings.</param>
         public void ReplaceSettings(AppSettings newSettings) {
             // Clone the new list, and stuff it into the old object.  This way the
             // objects aren't sharing lists.
@@ -213,8 +214,7 @@ namespace SourceGen {
         /// <summary>
         /// Merges settings from another settings object into this one.
         /// </summary>
-        /// <param name="settings"></param>
-        /// <param name="newSettings"></param>
+        /// <param name="newSettings">Object with new settings.</param>
         public void MergeSettings(AppSettings newSettings) {
             foreach (KeyValuePair<string, string> kvp in newSettings.mSettings) {
                 mSettings[kvp.Key] = kvp.Value;
diff --git a/SourceGen/Tools/Omf/WpfGui/OmfViewer.xaml b/SourceGen/Tools/Omf/WpfGui/OmfViewer.xaml
index e80d806..60d92cc 100644
--- a/SourceGen/Tools/Omf/WpfGui/OmfViewer.xaml
+++ b/SourceGen/Tools/Omf/WpfGui/OmfViewer.xaml
@@ -35,8 +35,8 @@ limitations under the License.
         <system:String x:Key="str_OmfFileLibraryStr">a Library file</system:String>
         <system:String x:Key="str_OmfFileIndeterminateStr">a file of indeterminate type</system:String>
 
-        <system:String x:Key="str_OmfFileSummaryFmt">This is {0}, with {1} segment</system:String>
-        <system:String x:Key="str_OmfFileSummaryPlFmt">This is {0}, with {1} segments</system:String>
+        <system:String x:Key="str_OmfFileSummaryFmt">This is {0}, with {1} segment (double-click to examine):</system:String>
+        <system:String x:Key="str_OmfFileSummaryPlFmt">This is {0}, with {1} segments (double-click to examine):</system:String>
         <system:String x:Key="str_OmfFileNot">This is not an Apple II OMF file</system:String>
 
         <system:String x:Key="str_OmfLoaderFail">Unable to prepare data file for project.</system:String>
diff --git a/SourceGen/Tools/VirtualHexDump.cs b/SourceGen/Tools/VirtualHexDump.cs
index 08e608d..8bc1f0c 100644
--- a/SourceGen/Tools/VirtualHexDump.cs
+++ b/SourceGen/Tools/VirtualHexDump.cs
@@ -32,7 +32,6 @@ namespace SourceGen.Tools {
     /// demand and retain the results indefinitely.
     /// </remarks>
     public class VirtualHexDump : IList, INotifyCollectionChanged, INotifyPropertyChanged {
-        /// <summary>
         /// <summary>
         /// Data to display.  We currently require that the entire file fit in memory,
         /// which is reasonable because we impose a 2^24 (16MB) limit.
diff --git a/SourceGen/Tools/WpfGui/HexDumpViewer.xaml b/SourceGen/Tools/WpfGui/HexDumpViewer.xaml
index 795321e..dd3616d 100644
--- a/SourceGen/Tools/WpfGui/HexDumpViewer.xaml
+++ b/SourceGen/Tools/WpfGui/HexDumpViewer.xaml
@@ -42,7 +42,7 @@ limitations under the License.
             <RowDefinition Height="Auto"/>
         </Grid.RowDefinitions>
         
-        <!-- DataGrid gives us Ctrl+A select-all and Ctrl+C text-copy built in. -->
+        <!-- DataGrid gives us Ctrl+A (select-all) and Ctrl+C (text-copy) built in. -->
         <DataGrid Name="hexDumpData" Grid.Row="0"
                   IsReadOnly="True"
                   ItemsSource="{Binding HexDumpLines}"
@@ -58,6 +58,8 @@ limitations under the License.
                   ScrollViewer.CanContentScroll="True"
                   VerticalScrollBarVisibility="Visible">
             <DataGrid.Columns>
+                <!-- Unqualified {Binding} creates a Binding object with default values.
+                This is how we reference the strings we get from the virtualized IList. -->
                 <DataGridTextColumn Header="Offset   0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  Text"
                                     Width="491" Binding="{Binding}"/>
             </DataGrid.Columns>
diff --git a/SourceGen/WpfGui/EditAppSettings.xaml.cs b/SourceGen/WpfGui/EditAppSettings.xaml.cs
index aed3010..3473962 100644
--- a/SourceGen/WpfGui/EditAppSettings.xaml.cs
+++ b/SourceGen/WpfGui/EditAppSettings.xaml.cs
@@ -45,6 +45,7 @@ namespace SourceGen.WpfGui {
 
         /// <summary>
         /// Reference to main controller.  Needed to push settings out when Apply/OK is clicked.
+        /// TODO: use an Event instead?
         /// </summary>
         private MainController mMainCtrl;