diff --git a/docs/conf.py b/docs/conf.py
index a9327e0..8671798 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -50,7 +50,7 @@
 
 # General information about the project.
 project = 'HypoPG'
-copyright = '2015-2018, Julien Rouhaud'
+copyright = '2015-2019, Julien Rouhaud'
 author = 'Julien Rouhaud'
 
 # The version info for the project you're documenting, acts as replacement for
@@ -103,7 +103,9 @@
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
-# html_theme_options = {}
+html_theme_options = {
+    'navigation_depth': 4
+}
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
diff --git a/docs/index.rst b/docs/index.rst
index 73b921c..ce5ff7f 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -19,7 +19,7 @@ This extension is compatible with **PostgreSQL 9.2 and above**.
 
 
 .. toctree::
-   :maxdepth: 1
+   :maxdepth: 2
    :caption: Contents:
 
    hypothetical_objects
diff --git a/docs/usage.rst b/docs/usage.rst
index aff752a..ce756ec 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -150,7 +150,7 @@ Some other convenience functions are available:
 .. code-block:: psql
 
   SELECT indexname, hypopg_get_indexdef(indexrelid) FROM hypopg_list_indexes() ;
-        indexname       |             hypopg_get_indexdef              
+        indexname       |             hypopg_get_indexdef
   ----------------------+----------------------------------------------
    <18284>btree_hypo_id | CREATE INDEX ON public.hypo USING btree (id)
   (1 row)
@@ -193,7 +193,7 @@ retrieve a row will do as expected:
 .. code-block:: psql
 
   EXPLAIN SELECT * FROM hypo_part_range WHERE id = 2;
-                              QUERY PLAN                            
+                              QUERY PLAN
   ------------------------------------------------------------------
    Seq Scan on hypo_part_range  (cost=0.00..537.99 rows=1 width=14)
      Filter: (id = 2)
@@ -234,7 +234,7 @@ partitioned table:
 .. code-block:: psql
 
   EXPLAIN SELECT * FROM hypo_part_range WHERE id = 2;
-                                             QUERY PLAN                                           
+                                             QUERY PLAN
   ------------------------------------------------------------------------------------------------
    Append  (cost=0.00..179.95 rows=1 width=14)
      ->  Seq Scan on hypo_part_range hypo_part_range_1_10000  (cost=0.00..179.95 rows=1 width=14)
@@ -249,7 +249,7 @@ partitions:
 .. code-block:: psql
 
   SELECT hypopg_create_index('CREATE INDEX on hypo_part_range_1_10000 (id)');
-                                                                    QUERY PLAN                                                                   
+                                                                    QUERY PLAN
   -----------------------------------------------------------------------------------------------------------------------------------------------
    Append  (cost=0.04..8.06 rows=1 width=14)
      ->  Index Scan using <258199>btree_hypo_part_range_1_10000_id on hypo_part_range hypo_part_range_1_10000  (cost=0.04..8.05 rows=1 width=14)
@@ -272,3 +272,11 @@ Some other convenience functions are available:
   a hypothetically partitioned table (including the stored statistics if any)
 - **hypopg_reset_table()**: remove all previously created hypothetical partition
   (inclufing the stored statistics if any)
+
+Limitations with hypothetical partitions
+----------------------------------------
+
+Unfortunately, some features can not be handled with hypothetical partitions:
+
+- UPDATE and DELETE on hypothetical partitions
+- partition-wise join on hypothetical partitions in PostgreSQL 11