kc3-lang/ftgl

diff --git a/docs/projects_using_ftgl.txt b/docs/projects_using_ftgl.txt
index b9222a2..0b756a8 100644
--- a/docs/projects_using_ftgl.txt
+++ b/docs/projects_using_ftgl.txt
@@ -35,6 +35,11 @@ Projects are listed in alphabetical order.
   %FTGL into a Python module so that it can be used in conjunction with
   PyOpenGL.
 
+\subsection tcl3d Tcl3D
+
+  Tcl3D (http://www.tcl3d.org) offers the 3D functionality of OpenGL
+  and other 3D libraries (including %FTGL) at the Tcl scripting level.
+
 \section current Projects currently using %FTGL
 
 \subsection agentw Agent World