1 files changed, 2 insertions, 0 deletions
diff --git a/src/fields/Doc.ts b/src/fields/Doc.ts
index 662792ff0..6c808c145 100644
--- a/src/fields/Doc.ts
+++ b/src/fields/Doc.ts
@@ -96,6 +96,7 @@ export const HighlightSym = Symbol('Highlight');
 export const DataSym = Symbol('Data');
 export const LayoutSym = Symbol('Layout');
 export const FieldsSym = Symbol('Fields');
+export const CssSym = Symbol('Css');
 export const AclSym = Symbol('Acl');
 export const DirectLinksSym = Symbol('DirectLinks');
 export const AclUnset = Symbol('AclUnset');
@@ -341,6 +342,7 @@ export class Doc extends RefField {
     @observable private ___fieldKeys: any = {};
     /// all of the raw acl's that have been set on this document.  Use GetEffectiveAcl to determine the actual ACL of the doc for editing
     @observable public [AclSym]: { [key: string]: symbol } = {};
+    @observable public [CssSym]: number = 0; // incrementer denoting a change to CSS layout
     @observable public [DirectLinksSym]: Set<Doc> = new Set();
     @observable public [AnimationSym]: Opt<Doc>;
     @observable public [HighlightSym]: boolean = false;