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diff --git a/substvars b/substvars
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--- a/substvars
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@@ -1 +1,7 @@
+Source-Version-Upstream: 5.45
 Tcl-Version: 8.6
+Common-Description:
+ Expect is a tool for automating interactive applications such as telnet, ftp,
+ passwd, fsck, rlogin, tip, etc.  Expect really makes this stuff trivial.
+ Expect is also useful for testing these same applications.  And by adding Tk,
+ you can wrap interactive applications in X11 GUIs.