diff --git a/include/wx/splitter.h b/include/wx/splitter.h
index 0383ecf2d6..0dc1c2a9ba 100644
--- a/include/wx/splitter.h
+++ b/include/wx/splitter.h
@@ -19,6 +19,7 @@
 // ----------------------------------------------------------------------------
 
 #define wxSP_NOBORDER         0x0000
+#define wxSP_THIN_SASH        0x0000    // NB: the default is 3D sash
 #define wxSP_NOSASH           0x0010
 #define wxSP_PERMIT_UNSPLIT   0x0040
 #define wxSP_LIVE_UPDATE      0x0080
diff --git a/interface/wx/splitter.h b/interface/wx/splitter.h
index 45ab945559..83c608e6ae 100644
--- a/interface/wx/splitter.h
+++ b/interface/wx/splitter.h
@@ -18,8 +18,10 @@
     @beginStyleTable
     @style{wxSP_3D}
            Draws a 3D effect border and sash.
+    @style{wxSP_THIN_SASH}
+           Draws a thin sash.
     @style{wxSP_3DSASH}
-           Draws a 3D effect sash.
+           Draws a 3D effect sash (part of default style).
     @style{wxSP_3DBORDER}
            Synonym for wxSP_BORDER.
     @style{wxSP_BORDER}