diff --git a/package.json b/package.json
index b7bd08c6..b5cbd006 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@soulcraft/brainy",
-  "version": "7.19.10",
+  "version": "7.19.11",
   "description": "Universal Knowledge Protocol™ - World's first Triple Intelligence database unifying vector, graph, and document search in one API. Stage 3 CANONICAL: 42 nouns × 127 verbs covering 96-97% of all human knowledge.",
   "main": "dist/index.js",
   "module": "dist/index.js",
diff --git a/src/types/brainy.types.ts b/src/types/brainy.types.ts
index d1d4c12c..c39e6c5e 100644
--- a/src/types/brainy.types.ts
+++ b/src/types/brainy.types.ts
@@ -889,6 +889,9 @@ export interface BrainyConfig {
   // Storage configuration
   storage?: {
     type: 'auto' | 'memory' | 'filesystem' | 's3' | 'r2' | 'opfs' | 'gcs'
+    /** Root directory for filesystem storage. Passed through to storage factories
+     *  including plugin-provided factories (e.g. Cortex mmap). */
+    rootDirectory?: string
     options?: any
     branch?: string              // COW branch name (default: 'main')
   }