diff --git a/docs/xml/lcl/extctrls.xml b/docs/xml/lcl/extctrls.xml
index 58b4f67b1a..3560cccd03 100644
--- a/docs/xml/lcl/extctrls.xml
+++ b/docs/xml/lcl/extctrls.xml
@@ -2242,7 +2242,11 @@
       <element name="TResizeStyle">
         <short>
           <var>TResizeStyle</var> - enumerated type for style of resizing using splitters</short>
-        <descr/>
+        <descr>
+          <var>rsLine</var> - draw a line, don't update splitter position during moving
+<var>rsNone</var> - draw nothing and don't update splitter position during moving
+<var>rsPattern</var> - draw a dot pattern, don't update splitter position during moving
+<var>rsUpdate</var> - draw nothing, update splitter position during moving  </descr>
         <seealso/>
       </element>
       <!-- enumeration value Visibility: default -->
diff --git a/lcl/extctrls.pp b/lcl/extctrls.pp
index cce9491f75..f028795e75 100644
--- a/lcl/extctrls.pp
+++ b/lcl/extctrls.pp
@@ -444,7 +444,12 @@ type
 
   { TCustomSplitter }
 
-  TResizeStyle = (rsLine,rsNone,rsPattern,rsUpdate);
+  TResizeStyle = (
+    rsLine,     // draw a line, don't update splitter position during moving
+    rsNone,     // draw nothing and don't update splitter position during moving
+    rsPattern,  // draw a dot pattern, don't update splitter position during moving
+    rsUpdate    // draw nothing, update splitter position during moving
+  );
 
   TCanResizeEvent = procedure(Sender: TObject; var NewSize: Integer;
     var Accept: Boolean) of object;