diff --git a/src/context.d.ts b/src/context.d.ts
index 9bc14286c8..d07832af8d 100644
--- a/src/context.d.ts
+++ b/src/context.d.ts
@@ -1,8 +1,6 @@
 import type {GeoStreamWrapper} from "d3";
 
-/**
- * Additional rendering context provided to marks and initializers.
- */
+/** Additional rendering context provided to marks and initializers. */
 export interface Context {
   /**
    * The current document. Defaults to window.document, but may be overridden
@@ -10,8 +8,6 @@ export interface Context {
    */
   document: Document;
 
-  /**
-   * The current projection, if any.
-   */
+  /** The current projection, if any. */
   projection?: GeoStreamWrapper;
 }
diff --git a/src/curve.d.ts b/src/curve.d.ts
index 6e9ee3424f..c3a8668ae9 100644
--- a/src/curve.d.ts
+++ b/src/curve.d.ts
@@ -1,8 +1,10 @@
 import type {CurveFactory} from "d3";
 
-type CurveFunction = CurveFactory;
+/** A curve implementation. */
+export type CurveFunction = CurveFactory;
 
-type CurveName =
+/** The built-in curve implementations. */
+export type CurveName =
   | "basis"
   | "basis-closed"
   | "basis-open"
@@ -60,6 +62,7 @@ export interface CurveOptions extends CurveAutoOptions {
   curve?: Curve;
 }
 
+/** Options for marks that support possibly-projected curves. */
 export interface CurveAutoOptions {
   /**
    * The curve (interpolation) method for connecting adjacent points. One of:
diff --git a/src/dimensions.d.ts b/src/dimensions.d.ts
index b57f28fa9d..3b5f34ba93 100644
--- a/src/dimensions.d.ts
+++ b/src/dimensions.d.ts
@@ -1,14 +1,26 @@
+/** The realized screen dimensions, in pixels, of a plot. */
 export interface Dimensions {
+  /** The outer width of the plot in pixels, including margins. */
   width: number;
+  /** The outer height of the plot in pixels, including margins. */
   height: number;
+  /** The distance between the inner and outer top edges of the plot. */
   marginTop: number;
+  /** The distance between the inner and outer right edges of the plot. */
   marginRight: number;
+  /** The distance between the inner and outer bottom edges of the plot. */
   marginBottom: number;
+  /** The distance between the inner and outer left edges of the plot. */
   marginLeft: number;
+  /** The default margins of the facet axes, if any. */
   facet?: {
+    /** The minimum top margin to reserve for facet axes. */
     marginTop: number;
+    /** The minimum right margin to reserve for facet axes. */
     marginRight: number;
+    /** The minimum bottom margin to reserve for facet axes. */
     marginBottom: number;
+    /** The minimum left margin to reserve for facet axes. */
     marginLeft: number;
   };
 }