debian/README.Debian

+lambda-align1 for Debian
+========================
+
+This is the packaging of version 1 of lambda-align.  Version 2
+can be found in the package lambda-align2.  For the rationale
+see the discussion on the Debian Med mailing list starting here:
+
+    https://lists.debian.org/debian-med/2019/01/msg00057.html
+
+ -- Andreas Tille <tille@debian.org>  Mon, 14 Jan 2019 21:13:57 +0100

debian/changelog

+lambda-align (1.0.3-5) UNRELEASED; urgency=medium
+
+  * Watch file reports only version 1
+  * Document choice of version 1 in README.Debian
+
+ -- Andreas Tille <tille@debian.org>  Mon, 14 Jan 2019 21:13:57 +0100
+
 lambda-align (1.0.3-4) unstable; urgency=medium
 
   * Team upload.

debian/watch

 version=4
-https://github.com/seqan/lambda/tags .*/lambda-v?(\d+\.[0-8][.\d]*)\.tar.gz
+https://github.com/seqan/lambda/tags .*/lambda-v?(1\.[0-8][.\d]*)\.tar.gz