Note limitations

crates/bevy_ecs/src/system/system_registry.rs

@@ -14,7 +14,11 @@ use crate::world::{Mut, World};
 ///
 /// Any [`Commands`](crate::system::Commands) generated by these systems (but not other systems), will immediately be applied.
 ///
-/// Stored systems cannot be chained: they can neither have an [`In`](crate::system::In) nor return any values.
+/// # Limitations
+///
+///  - stored systems cannot be chained: they can neither have an [`In`](crate::system::In) nor return any values.
+///  - stored systems cannot recurse: they cannot run other systems via the [`SystemRegistry`] methods on `World` or `Commands`.
+///  - exclusive systems cannot be used.
 ///
 /// # Examples
 ///
@@ -55,10 +59,6 @@ use crate::world::{Mut, World};
 ///     for _ in 0..7 {
 ///         commands.spawn().insert(Marker);
 ///     }
-///     
-///     // You can even run systems via commands,
-///     // which will take effect the next time commands are applied
-///     commands.run_system(assert_7_spawned)
 /// }
 ///
 /// fn assert_7_spawned(query: Query<(), Added<Marker>>){
@@ -67,6 +67,7 @@ use crate::world::{Mut, World};
 /// }
 ///
 /// world.run_system(spawn_7_entities);
+/// world.run_system(assert_7_spawned);
 /// ```
 ///
 /// ```rust