patchDocumentation: rev-parse: add a few "--verify" and "--default" examples

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index b6b2fe9..1d10893 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -378,6 +378,31 @@ C?        option C with an optional argument"
 eval `echo "$OPTS_SPEC" | git-rev-parse --parseopt -- "$@" || echo exit $?`
 ------------
 
+EXAMPLES
+--------
+
+* Print the SHA1 object name of the current commit:
++
+------------
+$ git rev-parse --verify HEAD
+------------
+
+* Print the commit SHA1 from the revision in the $REV shell variable:
++
+------------
+$ git rev-parse --verify $REV
+------------
++
+This will error out if $REV is empty or not a valid revision.
+
+* Same as above:
++
+------------
+$ git rev-parse --default master --verify $REV
+------------
++
+but if $REV is empty, the commit SHA1 from master will be printed.
+
 
 Author
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