diff --git a/doc/capi/index.rst.in b/doc/capi/index.rst.in
index a15f3b876035058113a61f2325cb739f01a39fbb..dad5482336472aa01355467687b2441b0a282a7b 100644
--- a/doc/capi/index.rst.in
+++ b/doc/capi/index.rst.in
@@ -29,7 +29,11 @@ C API
    When working with libcaosdb's C API keep the following in
    mind. Delete all objects (transactions, entities, properties,
    parents, ...) that you created using a `caosdb_..._create_...`
-   function and only those.
+   function or released using a `caosdb_..._release_...` and only
+   those. This means, that any objects set by a `caosdb_..._get_...`
+   function, are managed by another owning object (e.g., a connection
+   object managed by the connection manager) should not be deleted
+   manually.
 
    The underlying reason is that all C++ objects are realized in the
    Extern C interface as mutable structs containing a void pointer to