documentation: add tutorial for first contribution

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index a55536f0bfb2dfa3774e1b952ac4dee1eea6e505..2fd12524f95afef9c688d3402cd2a8b6d2d98c2e 100644 (file)
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -189,6 +189,12 @@ objects from the source repository into a pack in the cloned repository.
        values are given for the same key, each value will be written to
        the config file. This makes it safe, for example, to add
        additional fetch refspecs to the origin remote.
++
+Due to limitations of the current implementation, some configuration
+variables do not take effect until after the initial fetch and checkout.
+Configuration variables known to not take effect are:
+`remote.<name>.mirror` and `remote.<name>.tagOpt`.  Use the
+corresponding `--mirror` and `--no-tags` options instead.
 
 --depth <depth>::
        Create a 'shallow' clone with a history truncated to the