diff --git a/projects/harb.toml b/projects/harb.toml
index 8fed836..3bcb84c 100644
--- a/projects/harb.toml
+++ b/projects/harb.toml
@@ -1,6 +1,9 @@
 # projects/harb.toml — Project config for johba/harb
 #
 # This file defines project-specific settings for disinto agents.
+#
+# push3-evolution subsystem: fitness_flags field is comma-separated
+# (tools/push3-evolution/seeds/manifest.schema.json, harb#987)
 
 name            = "harb"
 repo            = "johba/harb"