diff --git a/src/ol/source/BingMaps.js b/src/ol/source/BingMaps.js
index 7db6aa1fff..e2bed7b93b 100644
--- a/src/ol/source/BingMaps.js
+++ b/src/ol/source/BingMaps.js
@@ -50,7 +50,7 @@ const TOS_ATTRIBUTION = '<a class="ol-attribution-bing-tos" ' +
 
 /**
  * @typedef {Object} Options
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {boolean} [hidpi=false] If `true` hidpi tiles will be requested.
  * @property {string} [culture='en-us'] Culture code.
  * @property {string} key Bing Maps API key. Get yours at http://www.bingmapsportal.com/.
diff --git a/src/ol/source/CartoDB.js b/src/ol/source/CartoDB.js
index bcc5c329cc..d2ab2183e5 100644
--- a/src/ol/source/CartoDB.js
+++ b/src/ol/source/CartoDB.js
@@ -9,7 +9,7 @@ import XYZ from './XYZ.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/OSM.js b/src/ol/source/OSM.js
index 3c9d6a3850..37bfc368f6 100644
--- a/src/ol/source/OSM.js
+++ b/src/ol/source/OSM.js
@@ -20,7 +20,7 @@ export const ATTRIBUTION = '&#169; ' +
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/Stamen.js b/src/ol/source/Stamen.js
index 5188bd254c..04f17bd558 100644
--- a/src/ol/source/Stamen.js
+++ b/src/ol/source/Stamen.js
@@ -90,7 +90,7 @@ const ProviderConfig = {
 
 /**
  * @typedef {Object} Options
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {string} layer Layer name.
  * @property {number} [minZoom] Minimum zoom.
  * @property {number} [maxZoom] Maximum zoom.
diff --git a/src/ol/source/TileArcGISRest.js b/src/ol/source/TileArcGISRest.js
index b14eac0654..8fa4196d35 100644
--- a/src/ol/source/TileArcGISRest.js
+++ b/src/ol/source/TileArcGISRest.js
@@ -13,7 +13,7 @@ import {appendParams} from '../uri.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/TileImage.js b/src/ol/source/TileImage.js
index 9018265e5d..3044abbec4 100644
--- a/src/ol/source/TileImage.js
+++ b/src/ol/source/TileImage.js
@@ -18,7 +18,7 @@ import {getForProjection as getTileGridForProjection} from '../tilegrid.js';
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
  * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/TileJSON.js b/src/ol/source/TileJSON.js
index af2804837f..ca3fbcca35 100644
--- a/src/ol/source/TileJSON.js
+++ b/src/ol/source/TileJSON.js
@@ -39,7 +39,7 @@ import {createXYZ, extentFromProjection} from '../tilegrid.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/TileWMS.js b/src/ol/source/TileWMS.js
index 8b0926c4c9..ac3c5566da 100644
--- a/src/ol/source/TileWMS.js
+++ b/src/ol/source/TileWMS.js
@@ -20,7 +20,7 @@ import {appendParams} from '../uri.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/WMTS.js b/src/ol/source/WMTS.js
index 18a36bc634..0118af6f15 100644
--- a/src/ol/source/WMTS.js
+++ b/src/ol/source/WMTS.js
@@ -15,7 +15,7 @@ import {appendParams} from '../uri.js';
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/XYZ.js b/src/ol/source/XYZ.js
index 205b68f2e2..8ceb0cc231 100644
--- a/src/ol/source/XYZ.js
+++ b/src/ol/source/XYZ.js
@@ -9,7 +9,7 @@ import {createXYZ, extentFromProjection} from '../tilegrid.js';
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
  * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
diff --git a/src/ol/source/Zoomify.js b/src/ol/source/Zoomify.js
index 6b1076402b..07996029ab 100644
--- a/src/ol/source/Zoomify.js
+++ b/src/ol/source/Zoomify.js
@@ -82,7 +82,7 @@ export class CustomTile extends ImageTile {
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions] Attributions.
- * @property {number} [cacheSize] Tile cache size. Default is twice as many tiles as a fullscreen map needs.
+ * @property {number} [cacheSize] Tile cache size. Default is four times as many tiles as a fullscreen map needs.
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value  you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.