diff --git a/action_map.yml b/action_map.yml
index 1c22a771..20aab9d1 100644
--- a/action_map.yml
+++ b/action_map.yml
@@ -231,8 +231,10 @@ app:
             arguments:
                 app:
                     help: App to install
+                    ask: "AppID or path to app archive"
                 -d:
                     full: --domain
+                    pattern: '^([a-zA-Z0-9]{1}([a-zA-Z0-9\-]*[a-zA-Z0-9])*)(\.[a-zA-Z0-9]{1}([a-zA-Z0-9\-]*[a-zA-Z0-9])*)*(\.[a-zA-Z]{1}([a-zA-Z0-9\-]*[a-zA-Z0-9])*)$'
                 -p:
                     full: --path
                 -l:
diff --git a/yunohost_app.py b/yunohost_app.py
index 4a9ca08d..95ca1a76 100644
--- a/yunohost_app.py
+++ b/yunohost_app.py
@@ -75,3 +75,48 @@ def app_list(offset=None, limit=None):
             }
 
     return list_dict
+
+def app_install(app, domain=None, path=None, label=None, public=False, protected=True):
+    """
+    Install selected app
+
+    Keyword arguments:
+        app -- AppID to install (or filename)
+        domain -- Web domain for the app
+        path -- Subpath of the domain
+        label -- User defined name for the app
+        public -- Allow app public access
+        protected -- App is protected by the SSO
+
+    Returns:
+        Win | Fail
+
+    """
+
+    # TODO: Check if the app is already installed
+
+    # TODO: Check if app is a file or part of the list.json
+
+    # TODO: Fetch git or unzip/untar archive 
+
+    # TODO: Check if exists another instance
+
+    # TODO: Create domain
+
+    # TODO: Install dependencies
+
+    # TODO: Exec install script
+
+    # TODO: Check if MYSQL DB is needed and create it, then init DB if needed
+
+    # TODO: Copy files to the right place
+
+    # TODO: Exec postinstall script
+
+    # TODO: Create appsettings
+
+    # TODO: Configure apache/lemon with NPZE's scripts
+
+
+
+