diff --git a/Documentation/git-patch-id.adoc b/Documentation/git-patch-id.adoc
index 92a1af36a2..013e1a6190 100644
--- a/Documentation/git-patch-id.adoc
+++ b/Documentation/git-patch-id.adoc
@@ -21,7 +21,7 @@ the same time also reasonably unique, i.e., two patches that have the same
 
 The main usecase for this command is to look for likely duplicate commits.
 
-When dealing with `git diff-tree` output, it takes advantage of
+When dealing with `git diff-tree --patch` output, it takes advantage of
 the fact that the patch is prefixed with the object name of the
 commit, and outputs two 40-byte hexadecimal strings.  The first
 string is the patch ID, and the second string is the commit ID.
@@ -31,8 +31,8 @@ OPTIONS
 -------
 
 `--verbatim`::
-	Calculate the patch-id of the input as it is given, do not strip
-	any whitespace.
+	Calculate the patch ID of the input as it is given, do not strip
+	any whitespace. Implies `--stable` and forbids `--unstable`.
 +
 This is the default if `patchid.verbatim` is `true`.
 
@@ -45,24 +45,24 @@ This is the default if `patchid.verbatim` is `true`.
   with two different settings for `-O<orderfile>` result in the same
   patch ID signature, thereby allowing the computed result to be used
   as a key to index some meta-information about the change between
-  the two trees;
+  the two trees.
 
-- Result is different from the value produced by git 1.9 and older
+- The result is different from the value produced by Git 1.9 and older
   or produced when an "unstable" hash (see `--unstable` below) is
   configured - even when used on a diff output taken without any use
   of `-O<orderfile>`, thereby making existing databases storing such
-  "unstable" or historical patch-ids unusable.
+  "unstable" or historical patch IDs unusable.
 
-- All whitespace within the patch is ignored and does not affect the id.
+- All whitespace within the patch is ignored and does not affect the ID.
 --
 +
 This is the default if `patchid.stable` is set to `true`.
 
 `--unstable`::
 	Use an "unstable" hash as the patch ID. With this option,
-	the result produced is compatible with the patch-id value produced
-	by git 1.9 and older and whitespace is ignored.  Users with pre-existing
-	databases storing patch-ids produced by git 1.9 and older (who do not deal
+	the result produced is compatible with the patch ID value produced
+	by Git 1.9 and older and whitespace is ignored.  Users with pre-existing
+	databases storing patch IDs produced by Git 1.9 and older (who do not deal
 	with reordered patches) may want to use this option.
 +
 This is the default.
diff --git a/builtin/patch-id.c b/builtin/patch-id.c
index d26e9d0c1e..2781598ede 100644
--- a/builtin/patch-id.c
+++ b/builtin/patch-id.c
@@ -228,9 +228,9 @@ int cmd_patch_id(int argc,
 	int opts = 0;
 	struct option builtin_patch_id_options[] = {
 		OPT_CMDMODE(0, "unstable", &opts,
-		    N_("use the unstable patch-id algorithm"), 1),
+		    N_("use the unstable patch ID algorithm"), 1),
 		OPT_CMDMODE(0, "stable", &opts,
-		    N_("use the stable patch-id algorithm"), 2),
+		    N_("use the stable patch ID algorithm"), 2),
 		OPT_CMDMODE(0, "verbatim", &opts,
 			N_("don't strip whitespace from the patch"), 3),
 		OPT_END()