diff --git a/physica-manual.pdf b/physica-manual.pdf
index feaa1af..fd4612a 100644
Binary files a/physica-manual.pdf and b/physica-manual.pdf differ
diff --git a/physica-manual.typ b/physica-manual.typ
index a9b9f46..bacc566 100644
--- a/physica-manual.typ
+++ b/physica-manual.typ
@@ -591,11 +591,12 @@ Functions: `differential(`\*_args_, \*\*_kwargs_`)`, abbreviated as `dd(`...`)`.
 - named _kwargs_:
   - `d`: the differential symbol [default: `upright(d)`].
   - `p`: the product symbol connecting the components [default: `none`].
+  - `compact`: only effective if `p` is `none`. If `#true`, will remove the TeXBook-advised thin spaces between the d-units [default: `#false`].
 
 TeXBook advises _[f]ormulas involving calculus look best when an extra thin space
 appears before dx or dy or d whatever_ (Chapter 18 p.168), and this package
-heeds this advice. If you don't want the spaces between the d-units, you may set
-in a `compact:#true` argument: $dd(r,theta) "vs." dd(r,theta,compact:#true)$ (compact).
+heeds this advice. If you don't want the spaces between the d-units, you may
+pass a `compact:#true` argument: $dd(r,theta) "vs." dd(r,theta,compact:#true)$ (compact).
 // https://github.com/typst/typst/issues/147 advocates for set rules for
 // non built-in functions. When that's implemented, user can do a
 // #set dd(compact: true) to set this param for all dd() invocations.