readme: explain bare repositories and paths

README.rst

@@ -6,7 +6,9 @@
 :date:   2015 Aug 31
 
 
-This program backups files and set of bare Git repositories into one Git repository.
+This program backups files and set of **bare** Git repositories into one Git
+repository. A bare repository is a repository that doesn't contain a working
+directory.
 Files are copied to blobs and then added to tree under certain place, and for
 Git repositories, all reachable objects are pulled in with maintaining index
 which remembers reference -> sha1 for all pulled repositories.
@@ -19,6 +21,10 @@ synchronize backups in several places.
 
 Backup workflow is:
 
+0. in case of some non-bare repositories:
+
+     $ git clone --bare nonbarerepo dir1
+
 1. create backup repository::
 
      $ mkdir backup
@@ -29,6 +35,7 @@ Backup workflow is:
 
      $ git-backup pull dir1:prefix1 dir2:prefix2 ...
 
+   where dir1 and dir2 are relative or absolute path.
    This will pull bare Git repositories & just files from `dir1` into backup
    under `prefix1`, from `dir2` into backup prefix `prefix2`, etc...