diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 82045a2522..dc829b333d 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -112,6 +112,9 @@ OPTIONS
 --remotes::
 	Show tag refs found in `$GIT_DIR/refs/remotes`.
 
+--show-toplevel::
+	Show the absolute path of the top-level directory.
+
 --show-prefix::
 	When the command is invoked from a subdirectory, show the
 	path of the current directory relative to the top-level
diff --git a/builtin-rev-parse.c b/builtin-rev-parse.c
index 37d0233521..cbe5b428ad 100644
--- a/builtin-rev-parse.c
+++ b/builtin-rev-parse.c
@@ -581,6 +581,12 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				for_each_remote_ref(show_reference, NULL);
 				continue;
 			}
+			if (!strcmp(arg, "--show-toplevel")) {
+				const char *work_tree = get_git_work_tree();
+				if (work_tree)
+					puts(work_tree);
+				continue;
+			}
 			if (!strcmp(arg, "--show-prefix")) {
 				if (prefix)
 					puts(prefix);