diff --git a/src/libostree/ostree-repo-finder.c b/src/libostree/ostree-repo-finder.c
index 576a690c..9be176af 100644
--- a/src/libostree/ostree-repo-finder.c
+++ b/src/libostree/ostree-repo-finder.c
@@ -432,8 +432,8 @@ G_DEFINE_BOXED_TYPE (OstreeRepoFinderResult, ostree_repo_finder_result,
  *    result
  * @priority: static priority of the result, where higher numbers indicate lower
  *    priority
- * @ref_to_checksum: (element-type OstreeCollectionRef utf8): map of collection–ref pairs
- *    to checksums provided by this result
+ * @ref_to_checksum: (element-type OstreeCollectionRef utf8) (transfer none):
+ *    map of collection–ref pairs to checksums provided by this result
  * @summary_last_modified: Unix timestamp (seconds since the epoch, UTC) when
  *    the summary file for the result was last modified, or `0` if this is unknown
  *
diff --git a/src/libostree/ostree-repo-refs.c b/src/libostree/ostree-repo-refs.c
index 9289bb37..ed496253 100644
--- a/src/libostree/ostree-repo-refs.c
+++ b/src/libostree/ostree-repo-refs.c
@@ -725,7 +725,8 @@ _ostree_repo_list_refs_internal (OstreeRepo       *self,
  * ostree_repo_list_refs:
  * @self: Repo
  * @refspec_prefix: (allow-none): Only list refs which match this prefix
- * @out_all_refs: (out) (element-type utf8 utf8): Mapping from ref to checksum
+ * @out_all_refs: (out) (element-type utf8 utf8) (transfer container):
+ *    Mapping from ref to checksum
  * @cancellable: Cancellable
  * @error: Error
  *
@@ -750,7 +751,8 @@ ostree_repo_list_refs (OstreeRepo       *self,
  * ostree_repo_list_refs_ext:
  * @self: Repo
  * @refspec_prefix: (allow-none): Only list refs which match this prefix
- * @out_all_refs: (out) (element-type utf8 utf8): Mapping from ref to checksum
+ * @out_all_refs: (out) (element-type utf8 utf8) (transfer container):
+ *    Mapping from ref to checksum
  * @flags: Options controlling listing behavior
  * @cancellable: Cancellable
  * @error: Error
@@ -778,7 +780,8 @@ ostree_repo_list_refs_ext (OstreeRepo                 *self,
  * ostree_repo_remote_list_refs:
  * @self: Repo
  * @remote_name: Name of the remote.
- * @out_all_refs: (out) (element-type utf8 utf8): Mapping from ref to checksum
+ * @out_all_refs: (out) (element-type utf8 utf8) (transfer container):
+ *    Mapping from ref to checksum
  * @cancellable: Cancellable
  * @error: Error
  *
@@ -893,7 +896,8 @@ remote_list_collection_refs_process_refs (OstreeRepo   *self,
  * ostree_repo_remote_list_collection_refs:
  * @self: Repo
  * @remote_name: Name of the remote.
- * @out_all_refs: (out) (element-type OstreeCollectionRef utf8): Mapping from collection–ref to checksum
+ * @out_all_refs: (out) (element-type OstreeCollectionRef utf8) (transfer container):
+ *    Mapping from collection–ref to checksum
  * @cancellable: Cancellable
  * @error: Error
  *
@@ -1165,7 +1169,8 @@ _ostree_repo_update_collection_refs (OstreeRepo        *self,
  * ostree_repo_list_collection_refs:
  * @self: Repo
  * @match_collection_id: (nullable): If non-%NULL, only list refs from this collection
- * @out_all_refs: (out) (element-type OstreeCollectionRef utf8): Mapping from collection–ref to checksum
+ * @out_all_refs: (out) (element-type OstreeCollectionRef utf8) (transfer container):
+ *    Mapping from collection–ref to checksum
  * @flags: Options controlling listing behavior
  * @cancellable: Cancellable
  * @error: Error
diff --git a/src/libostree/ostree-soup-form.c b/src/libostree/ostree-soup-form.c
index 74f9c7bb..dfaffb96 100644
--- a/src/libostree/ostree-soup-form.c
+++ b/src/libostree/ostree-soup-form.c
@@ -82,7 +82,7 @@ encode_pair (GString *str, const char *name, const char *value)
 
 /**
  * soup_form_encode_hash:
- * @form_data_set: (element-type utf8 utf8): a hash table containing
+ * @form_data_set: (element-type utf8 utf8) (transfer none): a hash table containing
  * name/value pairs (as strings)
  *
  * Encodes @form_data_set into a value of type
diff --git a/src/libostree/ostree-soup-uri.c b/src/libostree/ostree-soup-uri.c
index 97f74636..a3fa2acc 100644
--- a/src/libostree/ostree-soup-uri.c
+++ b/src/libostree/ostree-soup-uri.c
@@ -1281,7 +1281,7 @@ soup_uri_set_query (SoupURI *uri, const char *query)
 /**
  * soup_uri_set_query_from_form:
  * @uri: a #SoupURI
- * @form: (element-type utf8 utf8): a #GHashTable containing HTML form
+ * @form: (element-type utf8 utf8) (transfer none): a #GHashTable containing HTML form
  * information
  *
  * Sets @uri's query to the result of encoding @form according to the