diff --git a/crates/bevy_pbr/src/prepass/mod.rs b/crates/bevy_pbr/src/prepass/mod.rs
index cc5727405f0b4..d704c5a1c628d 100644
--- a/crates/bevy_pbr/src/prepass/mod.rs
+++ b/crates/bevy_pbr/src/prepass/mod.rs
@@ -385,6 +385,12 @@ where
         ));
         if key.mesh_key.contains(MeshPipelineKey::DEPTH_CLAMP_ORTHO) {
             shader_defs.push("DEPTH_CLAMP_ORTHO".into());
+            // PERF: This line forces the "prepass fragment shader" to always run in
+            // common scenarios like "directional light calculation". Doing so resolves
+            // a pretty nasty depth clamping bug, but it also feels a bit excessive.
+            // We should try to find a way to resolve this without forcing the fragment
+            // shader to run.
+            // https://github.com/bevyengine/bevy/pull/8877
             shader_defs.push("PREPASS_FRAGMENT".into());
         }