diff --git a/crates/effects/src/lib.rs b/crates/effects/src/lib.rs
index 645ae20bc..c4061f680 100644
--- a/crates/effects/src/lib.rs
+++ b/crates/effects/src/lib.rs
@@ -1248,11 +1248,11 @@ pub fn is_time_dependent(id: &str) -> bool {
     id.starts_with("ec.sim.") || TIME_DEPENDENT.contains(&id)
 }
 
-/// Does effect `id` read its own parameters at earlier times (CC Particle World samples its
-/// Birth Rate at every step, #1373)? Caches keyed on the current values can't see what an
+/// Does effect `id` read its own parameters at earlier times (the stepped particle systems sample
+/// their Birth Rate at every step, #1373)? Caches keyed on the current values can't see what an
 /// expression returned then.
 pub fn reads_param_history(id: &str) -> bool {
-    id == "ec.sim.ccparticleworld"
+    matches!(id, "ec.sim.ccparticleworld" | "ec.sim.ccparticlesystems2" | "ec.sim.ccmrmercury")
 }
 
 /// Run an effect on a buffer.