diff --git a/lib/ansible/modules/database/postgresql/postgresql_copy.py b/lib/ansible/modules/database/postgresql/postgresql_copy.py
index 845da0a5761..315920f8e11 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_copy.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_copy.py
@@ -51,6 +51,7 @@ options:
     description:
     - List of column names for the src/dst table to COPY FROM/TO.
     type: list
+    elements: str
     aliases: [ column ]
   program:
     description:
diff --git a/lib/ansible/modules/database/postgresql/postgresql_idx.py b/lib/ansible/modules/database/postgresql/postgresql_idx.py
index 816ff17b475..e4b9c5390ff 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_idx.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_idx.py
@@ -65,6 +65,7 @@ options:
     - List of index columns that need to be covered by index.
     - Mutually exclusive with I(state=absent).
     type: list
+    elements: str
     aliases:
     - column
   cond:
@@ -100,6 +101,7 @@ options:
     - Storage parameters like fillfactor, vacuum_cleanup_index_scale_factor, etc.
     - Mutually exclusive with I(state=absent).
     type: list
+    elements: str
   cascade:
     description:
     - Automatically drop objects that depend on the index,
diff --git a/lib/ansible/modules/database/postgresql/postgresql_info.py b/lib/ansible/modules/database/postgresql/postgresql_info.py
index f88cffa4ea2..1539cd7f42e 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_info.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_info.py
@@ -33,6 +33,7 @@ options:
     - If you pass including and excluding values to the filter, for example, I(filter=!settings,ver),
       the excluding values will be ignored.
     type: list
+    elements: str
   db:
     description:
     - Name of database to connect.
diff --git a/lib/ansible/modules/database/postgresql/postgresql_membership.py b/lib/ansible/modules/database/postgresql/postgresql_membership.py
index 31a781e0210..b11e8e18cf2 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_membership.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_membership.py
@@ -32,6 +32,7 @@ options:
     - The list of groups (roles) that need to be granted to or revoked from I(target_roles).
     required: yes
     type: list
+    elements: str
     aliases:
     - group
     - source_role
@@ -41,6 +42,7 @@ options:
     - The list of target roles (groups will be granted to them).
     required: yes
     type: list
+    elements: str
     aliases:
     - target_role
     - users
diff --git a/lib/ansible/modules/database/postgresql/postgresql_owner.py b/lib/ansible/modules/database/postgresql/postgresql_owner.py
index 8553b1d2c64..c2767a0df06 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_owner.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_owner.py
@@ -51,6 +51,7 @@ options:
     - Cannot reassign ownership of objects that are required by the database system.
     - Mutually exclusive with C(obj_type).
     type: list
+    elements: str
   fail_on_role:
     description:
     - If C(yes), fail when I(reassign_owned_by) role does not exist.
diff --git a/lib/ansible/modules/database/postgresql/postgresql_publication.py b/lib/ansible/modules/database/postgresql/postgresql_publication.py
index 4d55ad3c333..ae431e41ac3 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_publication.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_publication.py
@@ -41,6 +41,7 @@ options:
       nothing will be changed. If you need to add all tables to the publication with the same name,
       drop existent and create new without passing I(tables).
     type: list
+    elements: str
   state:
     description:
     - The publication state.
diff --git a/lib/ansible/modules/database/postgresql/postgresql_table.py b/lib/ansible/modules/database/postgresql/postgresql_table.py
index c3a25727b8d..75b5d3bb4a9 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_table.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_table.py
@@ -63,6 +63,7 @@ options:
     description:
     - Columns that are needed.
     type: list
+    elements: str
   rename:
     description:
     - New table name. Mutually exclusive with I(tablespace), I(owner),
@@ -79,6 +80,7 @@ options:
     - Storage parameters like fillfactor, autovacuum_vacuum_treshold, etc.
       Mutually exclusive with I(rename) and I(truncate).
     type: list
+    elements: str
   db:
     description:
     - Name of database to connect and where the table will be created.
diff --git a/lib/ansible/modules/database/postgresql/postgresql_user.py b/lib/ansible/modules/database/postgresql/postgresql_user.py
index 2f58ff24541..01b7204cb21 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_user.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_user.py
@@ -150,6 +150,7 @@ options:
     description:
     - The list of groups (roles) that need to be granted to the user.
     type: list
+    elements: str
     version_added: '2.9'
 notes:
 - The module creates a user (role) with login privilege by default.