diff --git a/docs/mcp.md b/docs/mcp.md
index c8841adf68..b220a1011c 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -3103,8 +3103,13 @@ The pattern commands (`object.pattern.make`, `object.pattern.edit`, `object.patt
 `object.repeat.options`) reject a param of the wrong type, such as `"instances": "8"`, `"edit": "false"` or
 `"tileType": 2`, and change nothing. `pattern.options` also rejects an `overlap` that is not an object, and an
 `overlap.h` other than `left` or `right` or an `overlap.v` other than `top` or `bottom`. `object.repeat.options` rejects
-a `center` that is not `[x, y]`, and `object.repeat.radial` rejects a negative `radius`. Omitting a param or giving null
-keeps its default.
+a `center` that is not `[x, y]`, and `object.repeat.radial` rejects a negative `radius`. In `object.pattern.make`,
+`object.pattern.saveCopy`, `object.repeat.radial`, `object.repeat.grid` and `object.repeat.mirror`, omitting a param or
+giving null keeps its default. In `pattern.options` and `object.repeat.options`, omitting a param or giving null keeps
+the pattern's or the repeat's current value, with one exception: a brick `tileType` in `pattern.options` or a brick
+`gridType` in `object.repeat.options` given without `brickOffset` sets the offset to 0.5. Without a `name`,
+`object.pattern.edit` edits the pattern that fills or strokes a selected object, and `pattern.options` changes the
+pattern being edited; each returns an error when there is no such pattern. `pattern.delete` requires `name`.
 
 ```json
 {"name":"run_command","arguments":{"command":"pattern.options","params":{"showSwatchBounds":true}}}