diff --git a/sdk-api-src/content/winuser/nf-winuser-iswindowvisible.md b/sdk-api-src/content/winuser/nf-winuser-iswindowvisible.md
index 70fe6279f02..eea0df1acd9 100644
--- a/sdk-api-src/content/winuser/nf-winuser-iswindowvisible.md
+++ b/sdk-api-src/content/winuser/nf-winuser-iswindowvisible.md
@@ -77,7 +77,7 @@ A handle to the window to be tested.
 
 Type: <b>BOOL</b>
 
-If the specified window, its parent window, its parent's parent window, and so forth, have the <b>WS_VISIBLE</b> style, the return value is nonzero. Otherwise, the return value is zero. 
+If the specified window, its parent window, its parent's parent window, and so forth, have the <b>WS_VISIBLE</b> style, the return value is nonzero. Otherwise, or in the case of an error, the return value is zero.
 
 Because the return value specifies whether the window has the <b>WS_VISIBLE</b> style, it may be nonzero even if the window is totally obscured by other windows.