diff --git a/api/app.py b/api/app.py
index cf0d106..72a1ecf 100644
--- a/api/app.py
+++ b/api/app.py
@@ -338,21 +338,25 @@ MANUAL_BUILD_PAIRS: Dict[str, str] = {
 # parse_sorting_rules runs. User-supplied rules come last so they override
 # auto-injected defaults on conflicting keys.
 #
-# Use cases vary — modpacks (HellDrinx) shipping their own load order,
-# individual mods (RV Interior Expansion) whose authors didn't declare
-# loadAfter in mod.info, or any other wsid whose presence implies a
-# specific sort constraint. The mechanism is generic; each rules file
-# describes its own scope in its header.
+# Provenance is encoded in the subdirectory:
+#   data/rules/modpack/  — mirrors of upstream modpack-author-bundled rules
+#                          (HellDrinx etc.). Update when upstream changes.
+#   data/rules/curated/  — sortof-operator-authored rules for individual
+#                          mods whose authors didn't declare load order
+#                          in their mod.info (RV Interior Expansion etc.).
+#
+# The loader is provenance-agnostic; trigger values are paths relative to
+# data/rules/.
 _RULES_DIR = Path(__file__).resolve().parent.parent / "data" / "rules"
 _RULES_TRIGGERS: Dict[str, str] = {
-    # HellDrinx FULL + LITE both bundle the same sorting rules.
-    "3672556207": "helldrinx.txt",  # HellDrinx FULL
-    "3662909244": "helldrinx.txt",  # HellDrinx LITE
-    # RVInteriorExpansion + Part2 chain after PROJECTRVInterior42.
-    # Expansion authors didn't declare loadAfter in their mod.info; without
-    # these rules sortof has no signal to chain the cluster.
-    "3618427553": "rv_expansion.txt",  # RVInteriorExpansion (rvupdate)
-    "3622163276": "rv_expansion.txt",  # RVInteriorExpansionPart2 (rv2)
+    # HellDrinx FULL + LITE share one upstream-mirrored modpack rules file.
+    "3672556207": "modpack/helldrinx.txt",   # HellDrinx FULL
+    "3662909244": "modpack/helldrinx.txt",   # HellDrinx LITE
+    # RVInteriorExpansion + Part2 chain after PROJECTRVInterior42 — sortof
+    # operator-curated; expansion authors didn't declare loadAfter in
+    # their mod.info, so sortof has no other signal to chain the cluster.
+    "3618427553": "curated/rv_expansion.txt",  # RVInteriorExpansion (rvupdate)
+    "3622163276": "curated/rv_expansion.txt",  # RVInteriorExpansionPart2 (rv2)
 }
 # Human-readable trigger labels for the warning message.
 _RULES_LABELS: Dict[str, str] = {
diff --git a/data/rules/rv_expansion.txt b/data/rules/curated/rv_expansion.txt
similarity index 78%
rename from data/rules/rv_expansion.txt
rename to data/rules/curated/rv_expansion.txt
index 4631c52..b3f4b70 100644
--- a/data/rules/rv_expansion.txt
+++ b/data/rules/curated/rv_expansion.txt
@@ -1,4 +1,7 @@
-; RV Interior Expansion (B42) — sorting rules
+; RV Interior Expansion (B42) — sortof-operator-curated sorting rules.
+; Provenance: data/rules/curated/. Edit freely when authoring new
+; load-order constraints for mods whose authors didn't declare them.
+;
 ; Triggers:
 ;   - 3618427553 (RVInteriorExpansion, map folder rvupdate)
 ;   - 3622163276 (RVInteriorExpansionPart2, map folder rv2)
diff --git a/data/rules/helldrinx.txt b/data/rules/modpack/helldrinx.txt
similarity index 93%
rename from data/rules/helldrinx.txt
rename to data/rules/modpack/helldrinx.txt
index 3a39760..5750f2d 100644
--- a/data/rules/helldrinx.txt
+++ b/data/rules/modpack/helldrinx.txt
@@ -1,11 +1,11 @@
-; HellDrinx modpack — bundled sorting rules
+; HellDrinx — modpack-author-bundled sorting rules (mirror of upstream).
+; Provenance: data/rules/modpack/. Update when the modpack publishes a
+; new sorting_rules.txt; do not edit unilaterally.
+;
 ; Triggers: HellDrinx FULL (3672556207), HellDrinx LITE (3662909244).
 ; Auto-injected by app.py:_auto_rules_for() when either trigger wsid is in
 ; the user's input. User-supplied rules are appended afterward and override
 ; these on conflicting keys.
-;
-; Source: HellDrinx FULL/LITE — keep this file in sync with the modpack's
-; upstream sorting_rules.txt when it updates.
 
 [PROJECTRVInterior42]
 loadFirst=on