This feature has been in Git for Windows since v2.11.0(2), as an
experimental option. Now it is considered mature, and it is high time to
document it properly.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 Documentation/git.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/git.txt b/Documentation/git.txt
index 7a1d629ca06..463b0eb0f5c 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -709,6 +709,24 @@ of clones and fetches.
        the background which do not want to cause lock contention with
        other operations on the repository.  Defaults to `1`.
 
+`GIT_REDIRECT_STDIN`::
+`GIT_REDIRECT_STDOUT`::
+`GIT_REDIRECT_STDERR`::
+       Windows-only: allow redirecting the standard input/output/error
+       handles to paths specified by the environment variables. This is
+       particularly useful in multi-threaded applications where the
+       canonical way to pass standard handles via `CreateProcess()` is
+       not an option because it would require the handles to be marked
+       inheritable (and consequently *every* spawned process would
+       inherit them, possibly blocking regular Git operations). The
+       primary intended use case is to use named pipes for communication
+       (e.g. `\\.\pipe\my-git-stdin-123`).
++
+Two special values are supported: `off` will simply close the
+corresponding standard handle, and if `GIT_REDIRECT_STDERR` is
+`2>&1`, standard error will be redirected to the same handle as
+standard output.
+
 Discussion[[Discussion]]
 ------------------------
 
-- 
2.15.0.windows.1

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