diff --git a/src/ejabberd_sm.erl b/src/ejabberd_sm.erl
index 344febb5d..79a7bdb2b 100644
--- a/src/ejabberd_sm.erl
+++ b/src/ejabberd_sm.erl
@@ -957,30 +957,36 @@ cache_nodes(Mod, LServer) ->
 %%% ejabberd commands
 
 get_commands_spec() ->
-    [#ejabberd_commands{name = connected_users,
-			tags = [session],
+    [#ejabberd_commands{name = connected_users, tags = [session],
 			desc = "List all established sessions",
                         policy = admin,
 			module = ?MODULE, function = connected_users, args = [],
+			result_desc = "List of users sessions",
+			result_example = [<<"user1@example.com">>, <<"user2@example.com">>],
 			result = {connected_users, {list, {sessions, string}}}},
-     #ejabberd_commands{name = connected_users_number,
-			tags = [session, stats],
+     #ejabberd_commands{name = connected_users_number, tags = [session, stats],
 			desc = "Get the number of established sessions",
                         policy = admin,
 			module = ?MODULE, function = connected_users_number,
+			result_example = 2,
 			args = [], result = {num_sessions, integer}},
-     #ejabberd_commands{name = user_resources,
-			tags = [session],
+     #ejabberd_commands{name = user_resources, tags = [session],
 			desc = "List user's connected resources",
                         policy = user,
 			module = ?MODULE, function = user_resources,
 			args = [],
+			args_desc = ["User name", "Server name"],
+			args_example = [<<"user1">>, <<"example.com">>],
+			result_example = [<<"tka1">>, <<"Gajim">>, <<"mobile-app">>],
 			result = {resources, {list, {resource, string}}}},
-     #ejabberd_commands{name = kick_user,
-			tags = [session],
+     #ejabberd_commands{name = kick_user, tags = [session],
 			desc = "Disconnect user's active sessions",
 			module = ?MODULE, function = kick_user,
 			args = [{user, binary}, {host, binary}],
+			args_desc = ["User name", "Server name"],
+			args_example = [<<"user1">>, <<"example.com">>],
+			result_desc = "Number of resources that were kicked",
+			result_example = 3,
 			result = {num_resources, integer}}].
 
 -spec connected_users() -> [binary()].
diff --git a/src/ext_mod.erl b/src/ext_mod.erl
index 86bd21983..6b3f7d548 100644
--- a/src/ext_mod.erl
+++ b/src/ext_mod.erl
@@ -80,16 +80,18 @@ code_change(_OldVsn, State, _Extra) ->
 get_commands_spec() ->
     [#ejabberd_commands{name = modules_update_specs,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "Update the module source code from Git",
+                        longdesc = "A connection to Internet is required",
                         module = ?MODULE, function = update,
                         args = [],
                         result = {res, rescode}},
      #ejabberd_commands{name = modules_available,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "List the contributed modules available to install",
                         module = ?MODULE, function = available_command,
+                        result_desc = "List of tuples with module name and description",
+                        result_example = [{mod_cron, "Execute scheduled commands"},
+                                          {mod_rest, "ReST frontend"}],
                         args = [],
                         result = {modules, {list,
                                   {module, {tuple,
@@ -97,9 +99,11 @@ get_commands_spec() ->
                                     {summary, string}]}}}}},
      #ejabberd_commands{name = modules_installed,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "List the contributed modules already installed",
                         module = ?MODULE, function = installed_command,
+                        result_desc = "List of tuples with module name and description",
+                        result_example = [{mod_cron, "Execute scheduled commands"},
+                                          {mod_rest, "ReST frontend"}],
                         args = [],
                         result = {modules, {list,
                                   {module, {tuple,
@@ -107,30 +111,35 @@ get_commands_spec() ->
                                     {summary, string}]}}}}},
      #ejabberd_commands{name = module_install,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "Compile, install and start an available contributed module",
                         module = ?MODULE, function = install,
+                        args_desc = "Module name",
+                        args_example = mod_rest,
                         args = [{module, binary}],
                         result = {res, rescode}},
      #ejabberd_commands{name = module_uninstall,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "Uninstall a contributed module",
                         module = ?MODULE, function = uninstall,
+                        args_desc = "Module name",
+                        args_example = mod_rest,
                         args = [{module, binary}],
                         result = {res, rescode}},
      #ejabberd_commands{name = module_upgrade,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "Upgrade the running code of an installed module",
+                        longdesc = "In practice, this uninstalls and installs the module",
                         module = ?MODULE, function = upgrade,
+                        args_desc = "Module name",
+                        args_example = mod_rest,
                         args = [{module, binary}],
                         result = {res, rescode}},
      #ejabberd_commands{name = module_check,
                         tags = [admin,modules],
-                        desc = "",
-                        longdesc = "",
+                        desc = "Check the contributed module repository compliance",
                         module = ?MODULE, function = check,
+                        args_desc = "Module name",
+                        args_example = mod_rest,
                         args = [{module, binary}],
                         result = {res, rescode}}
         ].
diff --git a/src/mod_mam.erl b/src/mod_mam.erl
index eb2082fe2..d4c18d41b 100644
--- a/src/mod_mam.erl
+++ b/src/mod_mam.erl
@@ -1008,6 +1008,9 @@ get_commands_spec() ->
 			longdesc = "Valid message TYPEs: "
 				   "\"chat\", \"groupchat\", \"all\".",
 			module = ?MODULE, function = delete_old_messages,
+			args_desc = ["Type of messages to delete (chat, groupchat, all)",
+                                     "Days to keep messages"],
+			args_example = [<<"all">>, 31],
 			args = [{type, binary}, {days, integer}],
 			result = {res, rescode}}].