chore: improve documentation of init module

lib/modules/init.nix

@@ -57,7 +57,7 @@ in
           type = with types; nullOr (either path str);
           default = null;
           description = ''
-            Lua code to call before plugins loaded
+            Lua code to call before loading any plugins or even any sloth-flake calls.
           '';
         };
 
@@ -65,7 +65,7 @@ in
           type = with types; nullOr (either path str);
           default = null;
           description = ''
-            Lua code called after init but before import
+            Lua code called after every non-lazy plugin’s init but before loading any plugin.
           '';
         };
 
@@ -73,7 +73,7 @@ in
           type = with types; nullOr (either path str);
           default = null;
           description = ''
-            Lua code called after all plugins are loaded
+            Lua code called after all plugins are loaded and configured.
           '';
         };
 
@@ -90,7 +90,12 @@ in
     option = mkOption {
       default = null;
       description = ''
-        init.lua configuration
+        init.lua configuration can be a string, a path or attribute set.
+
+        The attribute set form will call sloth-flake for you and load your
+        plugins. It allows you to hook at different moments in the loading
+        process of your plugins: before everything, after all plugins init code
+        is called and after everything is loaded.
       '';
       type = with types; coercedTo (nullOr (oneOf [path str])) coerceToModule self.module;
       example = ./init.lua;