diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index a55536f..2fd1252 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -189,6 +189,12 @@
 	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