diff --git a/chapter08/tcl.xml b/chapter08/tcl.xml
index 70e231013..f9ad17937 100644
--- a/chapter08/tcl.xml
+++ b/chapter08/tcl.xml
@@ -57,7 +57,7 @@
 
     <para>First, unpack the documentation by issuing the following command:</para>
 
-<screen><userinput remap="pre">tar -xf ../tcl8.6.10-html.tar.gz --strip-components=1</userinput></screen>
+<screen><userinput remap="pre">tar -xf ../tcl&tcl-version;-html.tar.gz --strip-components=1</userinput></screen>
 
     <para>Prepare Tcl for compilation:</para>