[PATCH] user-manual: mention git gui citool (commit, amend)

[Steffen Prohaska <prohaska@zib.de>]

git gui is especially useful because it allows to select diff hunks.
Now it is at least mentioned in the user-manual.

Signed-off-by: Steffen Prohaska <prohaska@zib.de>
---
 Documentation/user-manual.txt |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt
index 0071cd0..de4ec0b 100644
--- a/Documentation/user-manual.txt
+++ b/Documentation/user-manual.txt
@@ -1079,6 +1079,24 @@ $ git diff HEAD	    # difference between HEAD and working tree; what
 $ git status	    # a brief per-file summary of the above.
 -------------------------------------------------
 
+Another approach for creating commits is git gui:
+
+-------------------------------------------------
+$ git gui citool
+-------------------------------------------------
+
+starts the commit tool (Note, "`git gui`" starts the full gui, which
+provides more options).
+
+Beyond the basic operation of staging and unstaging complete files,
+git gui can also selectively stage diff hunks.  You can do so by
+selecting a modified or staged file and right-click on the diff view
+in the lower part of the gui. A pop-up will appear that lets you
+select a specific hunk and stage or unstage it for the next commit.
+This is particular useful for slicing large, ugly commits into smaller
+pieces, for example when cherry-picking (see
+<<reordering-patch-series>>).
+
 [[creating-good-commit-messages]]
 Creating good commit messages
 -----------------------------
@@ -2480,7 +2498,8 @@ $ gitk origin..mywork &
 And browse through the list of patches in the mywork branch using gitk,
 applying them (possibly in a different order) to mywork-new using
 cherry-pick, and possibly modifying them as you go using commit
---amend.
+--amend. git gui may be especially useful to amend commits as it
+lets you selectively stage and unstage single diff hunks.
 
 Another technique is to use git-format-patch to create a series of
 patches, then reset the state to before the patches:
-- 
1.5.3.rc3.122.g4978