diff --git a/docs/labs.md b/docs/labs.md
index 9188de9c74..3149c37465 100644
--- a/docs/labs.md
+++ b/docs/labs.md
@@ -7,6 +7,14 @@ to `Settings->Labs`. This list is non-exhaustive and subject to change, chat in
 **Be warned! Labs features are not finalised, they may be fragile, they may change, they may be
 dropped. Ask in the room if you are unclear about any details here.**
 
+## Matrix Spaces [MSC1772](https://github.com/matrix-org/matrix-doc/blob/matthew/msc1772/proposals/1772-groups-as-rooms.md) support (`feature_spaces`)
+
+Enables showing, using, creating, and managing spaces. Create Spaces from the all new Space Panel (to left of Room List).
+
+Incompatible with (will disable) `feature_custom_tags`, `feature_communities_v2_prototypes` and stable Communities/Groups support.
+
+Still in heavy development.
+
 ## Render LaTeX maths in messages (`feature_latex_maths`)
 
 Enables rendering of LaTeX maths in messages using [KaTeX](https://katex.org/). LaTeX between single dollar-signs is interpreted as inline maths and double dollar-signs as display maths (i.e. centred on its own line).