diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt
index 1eeb1c76838c1911fc4d57b36a16dece0538809a..b71712473ed13020bca3f133ea4a28c5081b7f9e 100644
--- a/Documentation/diff-format.txt
+++ b/Documentation/diff-format.txt
@@ -1,4 +1,7 @@
-The output format from "git-diff-index", "git-diff-tree",
+Raw output format
+-----------------
+
+The raw output format from "git-diff-index", "git-diff-tree",
 "git-diff-files" and "git diff --raw" are very similar.
 
 These commands all compare two sets of things; what is
@@ -16,6 +19,9 @@ git-diff-tree [-r] <tree-ish-1> <tree-ish-2> [<pattern>...]::
 git-diff-files [<pattern>...]::
         compares the index and the files on the filesystem.
 
+The "git-diff-tree" command begins its ouput by printing the hash of
+what is being compared. After that, all the commands print one output
+line per changed file.
 
 An output line is formatted this way:
 
diff --git a/Documentation/git-diff-files.txt b/Documentation/git-diff-files.txt
index c5261415643d359648900e17f522ba7b96fed44a..4ef03578ebc58f3b678e8805644ae8c0ad4b998b 100644
--- a/Documentation/git-diff-files.txt
+++ b/Documentation/git-diff-files.txt
@@ -43,8 +43,7 @@ omit diff output for unmerged entries and just show "Unmerged".
 -q::
 	Remain silent even on nonexistent files
 
-Output format
--------------
+
 include::diff-format.txt[]
 
 
diff --git a/Documentation/git-diff-index.txt b/Documentation/git-diff-index.txt
index 26920d4f63cd213ff17ab28d8dd0dbea94482147..8b9ed2929980ec9928930496375df5e9d72e4b51 100644
--- a/Documentation/git-diff-index.txt
+++ b/Documentation/git-diff-index.txt
@@ -34,8 +34,6 @@ include::diff-options.txt[]
 	'git-diff-index' say that all non-checked-out files are up
 	to date.
 
-Output format
--------------
 include::diff-format.txt[]
 
 Operating Modes
diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt
index 23b7abd3c6b0e02eb325983eaad66598c42fc8be..f2cef1260b7f74254b96ce65f8aa55267b618c29 100644
--- a/Documentation/git-diff-tree.txt
+++ b/Documentation/git-diff-tree.txt
@@ -159,8 +159,7 @@ HEAD commits it finds, which is even more interesting.
 
 in case you care).
 
-Output format
--------------
+
 include::diff-format.txt[]
 
 
diff --git a/Documentation/git-diff.txt b/Documentation/git-diff.txt
index a2f192fb7519117f8e47f3ec4608e3301c200dc3..0ac711230e24bf7238b2e3a215cdc3c4ce0d2087 100644
--- a/Documentation/git-diff.txt
+++ b/Documentation/git-diff.txt
@@ -84,8 +84,7 @@ include::diff-options.txt[]
 	the diff to the named paths (you can give directory
 	names and get diff for all files under them).
 
-Output format
--------------
+
 include::diff-format.txt[]
 
 EXAMPLES