Documentation: explain push.default option a bit more

diff --git a/Documentation/git-blame.txt b/Documentation/git-blame.txt
index c4d1ff86c90d22ffea3fff173ee6b76d88013dab..9516914236bbfa675006994620b1c8f61855de1d 100644 (file)
--- a/Documentation/git-blame.txt
+++ b/Documentation/git-blame.txt
@@ -9,7 +9,7 @@ SYNOPSIS
 --------
 [verse]
 'git blame' [-c] [-b] [-l] [--root] [-t] [-f] [-n] [-s] [-e] [-p] [-w] [--incremental] [-L n,m]
-           [-S <revs-file>] [-M] [-C] [-C] [-C] [--since=<date>]
+           [-S <revs-file>] [-M] [-C] [-C] [-C] [--since=<date>] [--abbrev=<n>]
            [<rev> | --contents <file> | --reverse <rev>] [--] <file>
 
 DESCRIPTION
@@ -73,6 +73,11 @@ include::blame-options.txt[]
        Ignore whitespace when comparing the parent's version and
        the child's to find where the lines came from.
 
+--abbrev=<n>::
+       Instead of using the default 7+1 hexadecimal digits as the
+       abbreviated object name, use <n>+1 digits. Note that 1 column
+       is used for a caret to mark the boundary commit.
+
 
 THE PORCELAIN FORMAT
 --------------------
@@ -100,6 +105,19 @@ The contents of the actual line is output after the above
 header, prefixed by a TAB. This is to allow adding more
 header elements later.
 
+The porcelain format generally suppresses commit information that has
+already been seen. For example, two lines that are blamed to the same
+commit will both be shown, but the details for that commit will be shown
+only once. This is more efficient, but may require more state be kept by
+the reader. The `--line-porcelain` option can be used to output full
+commit information for each line, allowing simpler (but less efficient)
+usage like:
+
+       # count the number of lines attributed to each author
+       git blame --line-porcelain file |
+       sed -n 's/^author //p' |
+       sort | uniq -c | sort -rn
+
 
 SPECIFYING RANGES
 -----------------