diff --git a/_oasis b/_oasis
index bd4e8a18..d39a25cd 100644
--- a/_oasis
+++ b/_oasis
@@ -59,7 +59,7 @@ Library "containers"
 
 Library "containers_io"
   Path:             src/io
-  Modules:
+  Modules:          Containers_io_is_deprecated
   BuildDepends:     bytes
   FindlibParent:    containers
   FindlibName:      io
diff --git a/src/advanced/CCMonadIO.ml.cppo b/src/advanced/CCMonadIO.cppo.ml
similarity index 100%
rename from src/advanced/CCMonadIO.ml.cppo
rename to src/advanced/CCMonadIO.cppo.ml
diff --git a/src/io/containers_io_is_deprecated.ml b/src/io/containers_io_is_deprecated.ml
new file mode 100644
index 00000000..4784fafb
--- /dev/null
+++ b/src/io/containers_io_is_deprecated.ml
@@ -0,0 +1,7 @@
+(** {!CCIO} has moved into {!Containers}, the main library.
+ 
+  The reason is that it has no additional dependency and is arguably a
+  useful completement to parts of {!Pervasives} (the channel management)
+
+  As a result, linking "containers" rather than "containers.io" should be
+  enough if one needs {!CCIO}. *)