diff --git a/imio/__init__.py b/imio/__init__.py
index 46900e5..1b3c804 100644
--- a/imio/__init__.py
+++ b/imio/__init__.py
@@ -1,3 +1,12 @@
+from warnings import warn
+
+warn(
+    "imio has merged into brainglobe-utils as a submodule."
+    "To remain up to date, please install brainglobe-utils and use the image_io submodule:"
+    "https://github.com/brainglobe/brainglobe-utils",
+    DeprecationWarning,
+)
+
 __author__ = "Charly Rousseau, Adam Tyson"
 __version__ = "0.2.4"