diff --git a/src/streamlit_extras/bottom_container/__init__.py b/src/streamlit_extras/bottom_container/__init__.py
index 898fe09e..62011632 100644
--- a/src/streamlit_extras/bottom_container/__init__.py
+++ b/src/streamlit_extras/bottom_container/__init__.py
@@ -14,6 +14,9 @@
 def bottom() -> DeltaGenerator:
     """
     Insert a multi-element container that sticks to the bottom of the app.
+
+    Note that this can only be in the main body of the app, and not in
+    other parts e.g. st.sidebar
     """
     if hasattr(st, "_bottom"):
         return st._bottom