diff --git a/docs/api/web-contents.md b/docs/api/web-contents.md
index a7d8e7230c9..7380529fca1 100644
--- a/docs/api/web-contents.md
+++ b/docs/api/web-contents.md
@@ -1117,6 +1117,10 @@ increment above or below represents zooming 20% larger or smaller to default
 limits of 300% and 50% of original size, respectively. The formula for this is
 `scale := 1.2 ^ level`.
 
+> **NOTE**: The zoom policy at the Chromium level is same-origin, meaning that the
+> zoom level for a specific domain propagates across all instances of windows with
+> the same domain. Differentiating the window URLs will make zoom work per-window.
+
 #### `contents.getZoomLevel()`
 
 Returns `Number` - the current zoom level.
diff --git a/docs/api/web-frame.md b/docs/api/web-frame.md
index 9cfc4f2c3b4..da688f18d3b 100644
--- a/docs/api/web-frame.md
+++ b/docs/api/web-frame.md
@@ -41,6 +41,10 @@ Changes the zoom level to the specified level. The original size is 0 and each
 increment above or below represents zooming 20% larger or smaller to default
 limits of 300% and 50% of original size, respectively.
 
+> **NOTE**: The zoom policy at the Chromium level is same-origin, meaning that the
+> zoom level for a specific domain propagates across all instances of windows with
+> the same domain. Differentiating the window URLs will make zoom work per-window.
+
 ### `webFrame.getZoomLevel()`
 
 Returns `Number` - The current zoom level.
diff --git a/docs/api/webview-tag.md b/docs/api/webview-tag.md
index b116b033efe..b7fab619fab 100644
--- a/docs/api/webview-tag.md
+++ b/docs/api/webview-tag.md
@@ -648,6 +648,10 @@ increment above or below represents zooming 20% larger or smaller to default
 limits of 300% and 50% of original size, respectively. The formula for this is
 `scale := 1.2 ^ level`.
 
+> **NOTE**: The zoom policy at the Chromium level is same-origin, meaning that the
+> zoom level for a specific domain propagates across all instances of windows with
+> the same domain. Differentiating the window URLs will make zoom work per-window.
+
 ### `<webview>.getZoomFactor()`
 
 Returns `Number` - the current zoom factor.