diff --git a/README.md b/README.md
index 0ae4a23..329e719 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,11 @@ postgres_ha_alter_system_settings:
   min_wal_size: '80MB'
 ```
 
+Container share memory can be configured with:
+```yaml
+postgres_share_memory: '1g'
+```
+
 # Management
 
 The service is managed using [Docker Compose](https://docs.docker.com/compose/):
diff --git a/defaults/main.yml b/defaults/main.yml
index 056f268..5c8df96 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -15,6 +15,7 @@ postgres_ha_host_uid: '{{ 100000 + postgres_ha_cont_uid | int }}'
 postgres_ha_cont_run_size: '512K'
 postgres_ha_cont_tmp_size: '256K'
 
+#postgres_share_memory: '64m'
 # Alter System
 postgres_ha_alter_system_settings: {}
 #  max_wal_size: '1GB'
diff --git a/templates/docker-compose.yml.j2 b/templates/docker-compose.yml.j2
index 5c0a5b3..b7de038 100644
--- a/templates/docker-compose.yml.j2
+++ b/templates/docker-compose.yml.j2
@@ -5,6 +5,9 @@ services:
     container_name: '{{ postgres_ha_cont_name }}'
     image: '{{ postgres_ha_cont_image }}'
     restart: always
+{% if postgres_share_memory is defined %}
+    shm_size: '{{ postgres_share_memory }}'
+{% endif %}
     environment:
       POSTGRES_DB:       '{{ postgres_ha_db_name | mandatory }}'
       POSTGRES_USER:     '{{ postgres_ha_admin_user }}'