diff --git a/docs/manual/README.md b/docs/manual/README.md
index a410fc5..1df7673 100644
--- a/docs/manual/README.md
+++ b/docs/manual/README.md
@@ -51,6 +51,8 @@ it reads without telling the colours apart, and the filter bar has a chip for
 each. In develop, the top bar names the open photograph's label and sets it,
 and the same keys work there.
 
+![Labelling four frames with 6, 7, 8 and 9, taking one off with the same key, and filtering the grid to green](media/library-labels.gif)
+
 ### Getting about
 
 Drag the timeline to scrub through years; Ctrl and the wheel resize the
@@ -123,9 +125,11 @@ Hold `Before` to see the photograph as it was.
 ### Looking closer
 
 Double-click for 1:1; drag to move about; double-click again to fit. The
-wheel zooms to any amount in between.
+wheel zooms to any amount in between. Past 1:1 the file's own pixels are
+drawn as hard-edged blocks rather than smoothed, so what you see is what
+the sensor recorded.
 
-![Zooming to 1:1, panning, and back](media/develop-zoom.gif)
+![Zooming to 1:1, panning, then on in with the wheel until the pixels are blocks](media/develop-zoom.gif)
 
 ### Moving between photographs
 
@@ -151,6 +155,17 @@ ratio from the chips. `Done composing` returns to the photograph.
 
 ![Cropping, straightening and choosing a ratio](media/compose.gif)
 
+`Vertical` and `Horizontal`, under `Straighten`, correct the lines that
+converge when the camera is tilted up at a building; the crop refits to
+what is left.
+
+![Standing towers shot from below upright with the Vertical slider](media/compose-perspective.gif)
+
+A crop that leaves a mask wholly outside the frame says so, and offers to
+take the crop back or keep it.
+
+![A stroke in a corner, a crop that leaves it outside, and the notice with Undo crop and Keep crop](media/crop-orphan.gif)
+
 ### Local adjustments
 
 `Local` in the rail turns the column into a mask stack. `Find subjects` runs a
@@ -169,7 +184,11 @@ tinted, as alpha, or as an outline; the eye on its row switches it off.
 ![Looking at the mask three ways, painting into it, then growing its edge](media/local-paint.gif)
 
 Linear and radial gradients, a tone range and a colour range are the other
-ways to make one; each can be combined with any other.
+ways to make one; each can be combined with any other. `∩ Intersect` keeps
+only where the new part and the mask agree: below, a gradient over the
+lower half, then two strokes that survive only where the gradient is.
+
+![A linear gradient, then Intersect and two painted strokes](media/local-intersect.gif)
 
 ### Repair
 
diff --git a/docs/manual/media/compose-perspective.gif b/docs/manual/media/compose-perspective.gif
new file mode 100644
index 0000000..ee39f13
--- /dev/null
+++ b/docs/manual/media/compose-perspective.gif
@@ -0,0 +1,3 @@
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+size 1575017
diff --git a/docs/manual/media/crop-orphan.gif b/docs/manual/media/crop-orphan.gif
new file mode 100644
index 0000000..1139ae8
--- /dev/null
+++ b/docs/manual/media/crop-orphan.gif
@@ -0,0 +1,3 @@
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+size 690391
diff --git a/docs/manual/media/library-labels.gif b/docs/manual/media/library-labels.gif
new file mode 100644
index 0000000..9233f71
--- /dev/null
+++ b/docs/manual/media/library-labels.gif
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8f1a4267658d3fc01cb0915046466499eb61e64fe98ca978b70ccc3c7763f3d0
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diff --git a/docs/manual/media/local-intersect.gif b/docs/manual/media/local-intersect.gif
new file mode 100644
index 0000000..4087b3f
--- /dev/null
+++ b/docs/manual/media/local-intersect.gif
@@ -0,0 +1,3 @@
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+oid sha256:4fba35a5c49574cd52e6d85a419f9ab84a4c58bcf4cc90c6563a18735db4047a
+size 691125