diff --git a/doc/contributing.rdoc b/doc/contributing.rdoc
index 1f560506d2..d8945478cb 100644
--- a/doc/contributing.rdoc
+++ b/doc/contributing.rdoc
@@ -264,7 +264,6 @@ run tests.
 You should also have access to development headers for the following
 libraries, but these are not required:
 
-* Tcl/Tk
 * NDBM/QDBM
 * GDBM
 * OpenSSL