diff --git a/docs/concepts/projects/workspaces.md b/docs/concepts/projects/workspaces.md
index 942cea8c2..4b2d670b4 100644
--- a/docs/concepts/projects/workspaces.md
+++ b/docs/concepts/projects/workspaces.md
@@ -113,6 +113,13 @@ build-backend = "hatchling.build"
 Every workspace member would, by default, install `tqdm` from GitHub, unless a specific member
 overrides the `tqdm` entry in its own `tool.uv.sources` table.
 
+!!! note
+
+    If a workspace member provides `tool.uv.sources` for some dependency, it will ignore any
+    `tool.uv.sources` for the same dependency in the workspace root, even if the member's source is
+    limited by a [marker](dependencies.md#platform-specific-sources) that doesn't match the current
+    platform.
+
 ## Workspace layouts
 
 The most common workspace layout can be thought of as a root project with a series of accompanying