clarify wording re source files

diff --git a/dh_install b/dh_install
index 1483d273874f048f038f9aae6d40b04c267a31ba..5a3a7f583735166719b526606a1341d17d6d14c8 100755 (executable)
--- a/dh_install
+++ b/dh_install
@@ -86,8 +86,9 @@ warned about.
 
 =item B<--sourcedir=dir>
 
-Makes all source files be found under dir. If this is specified, it is
-akin to all the source filenames having "dir/" prepended to them.
+Makes all files to be installed be found under dir. If this is
+specified, it is akin to all the filenames having "dir/" prepended
+to them.
 
 To make dh_install behave like the old dh_movefiles, move your
 package.files file to package.install and call dh_install with