diff --git a/src/LedgerAcquire.h b/src/LedgerAcquire.h
index f06c4dbab..211567d32 100644
--- a/src/LedgerAcquire.h
+++ b/src/LedgerAcquire.h
@@ -60,7 +60,7 @@ typedef std::vector<unsigned char> VUC;
 class THSyncFilter : public SHAMapSyncFilter
 {
 protected:
-	NodeCache* mCache;
+	NodeCache* mCache; // holds nodes we see during the consensus process
 
 public:
 	THSyncFilter(NodeCache* cache) : mCache(cache) { ; }