diff --git a/README.md b/README.md
index 6c2f345..6f8b984 100644
--- a/README.md
+++ b/README.md
@@ -1334,7 +1334,7 @@ draw.go         one reference draw per render and group: the draw set a render r
 drawfence.go    the load fences over reference draws: the drawGroup option, and the walk over a render's reads
 family.go       a family of linked tables: what a reference path reads of one, and the fence over paths into it
 reference.go    reference sigils, and binding references across the tree
-graph.go        the graph the fences walk: containment and render edges, and the cycle and repeat fences
+graph.go        the node graph: tree walks, containment and render edges, and the cycle and repeat fences
 builtins.go     the {name()} function registry and its implementations
 layout.go       date and time layouts: the instants one is proved against, and the two samples
 checksum.go     the check characters a derivation appends, and the IBAN they sit inside
@@ -1342,7 +1342,7 @@ transform.go    the builtins that rewrite an operand's value, and the ASCII fold
 calc.go         the {calc()} arithmetic evaluator: parser, eval, validation
 datatype.go     column datatypes: DataType, where datatype and null may sit, a column's datatype
 value.go        the value proof: what a typed column or calc operand holds, checked at load
-data.go         the load path: fs.FS folders/files -> namespace tree, multi-source merge, then the fences in order
+data.go         the load path: fs.FS folders/files -> merged namespace tree, and the fence order every scope runs
 cmd/fejkdata/   the fejkdata CLI
 data/           shipped data (JSON, and a TSV per table), embedded at build: locale folders, geo, misc
 data-import/    the scripts that rebuild each sourced table (see DATA-LICENSES.md)
diff --git a/data.go b/data.go
index 3ad356f..5299de3 100644
--- a/data.go
+++ b/data.go
@@ -215,8 +215,8 @@ func checkScope(s nodeScope) error {
 
 // checkRenders runs the per-node fences over a scope, each over the whole scope
 // before the next, so which of several broken nodes is reported does not depend on
-// the walk. It runs after checkNoCycles, whose guarantee is what lets the walks
-// terminate.
+// the walk. Its walks terminate only where nothing renders itself, so run it over a
+// loaded tree after checkNoCycles.
 func checkRenders(s nodeScope) error {
 	mem := reachMemo{}
 	if err := s(func(path string, n node) error { return repeatCheck(path, n, mem) }); err != nil {