-Cnnverts a gbp patches-unapplied branch
-(not a gbp pq patch queue branch)
-into a git-debrebase interchange branch.
+Converts any of the following into a git-debrebase interchange branch:
+
+=over
+
+=item
+
+a gbp patches-unapplied branch (but not a gbp pq patch-queue branch)
+
+=item
+
+a patches-unapplied git packaging branch containing debian/patches,
+as used with quilt
+
+=item
+
+a git branch for a package which has no Debian delta -
+ie where upstream files are have not been modified in Debian,
+so there are no patches
+
+=back
+
+(These two commands operate identically and are simply aliases.)