diff --git a/src/ol/source/Source.js b/src/ol/source/Source.js
index 30a43bac55..2ccb0742bd 100644
--- a/src/ol/source/Source.js
+++ b/src/ol/source/Source.js
@@ -31,7 +31,7 @@ import SourceState from './State.js';
 /**
  * @typedef {Object} Options
  * @property {AttributionLike} [attributions]
- * @property {boolean} [attributionsCollapsible] Whether attributions should be collapsible.
+ * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
  * @property {import("../proj.js").ProjectionLike} projection
  * @property {SourceState} [state]
  * @property {boolean} [wrapX]
@@ -129,7 +129,7 @@ class Source extends BaseObject {
   }
 
   /**
-   * @return {boolean} Should the attributions be collapsible or not.
+   * @return {boolean} Aattributions are collapsible.
    */
   getAttributionsCollapsible() {
     return this.attributionsCollapsible_;
diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index df5c52be50..79d0e80fa1 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -14,7 +14,7 @@ import {wrapX, getForProjection as getTileGridForProjection} from '../tilegrid.j
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions]
- * @property {boolean} [attributionsCollapsible] Whether attributions should be collapsible.
+ * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
  * @property {number} [cacheSize]
  * @property {boolean} [opaque]
  * @property {number} [tilePixelRatio]
diff --git a/src/ol/source/TileImage.js b/src/ol/source/TileImage.js
index e8c76be862..6bcb30bb8f 100644
--- a/src/ol/source/TileImage.js
+++ b/src/ol/source/TileImage.js
@@ -17,7 +17,7 @@ import {getForProjection as getTileGridForProjection} from '../tilegrid.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {boolean} [attributionsCollapsible] Whether attributions should be collapsible.
+ * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
  * @property {number} [cacheSize=2048] Cache size.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to
diff --git a/src/ol/source/UrlTile.js b/src/ol/source/UrlTile.js
index b606425d0a..0f26b3836e 100644
--- a/src/ol/source/UrlTile.js
+++ b/src/ol/source/UrlTile.js
@@ -11,7 +11,7 @@ import {getKeyZXY} from '../tilecoord.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions]
- * @property {boolean} [attributionsCollapsible] Whether attributions should be collapsible.
+ * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
  * @property {number} [cacheSize]
  * @property {boolean} [opaque]
  * @property {import("../proj.js").ProjectionLike} [projection]
diff --git a/src/ol/source/XYZ.js b/src/ol/source/XYZ.js
index ae9ad2f7ee..3da8ff4005 100644
--- a/src/ol/source/XYZ.js
+++ b/src/ol/source/XYZ.js
@@ -8,7 +8,7 @@ import {createXYZ, extentFromProjection} from '../tilegrid.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {boolean} [attributionsCollapsible] Whether attributions should be collapsible.
+ * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
  * @property {number} [cacheSize=2048] Cache size.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to