diff --git a/MANUAL.md b/MANUAL.md
index 15f6192b2..42f11ae7d 100644
--- a/MANUAL.md
+++ b/MANUAL.md
@@ -271,6 +271,9 @@ parse order. This is different from ledger, which currently goes
 strictly by parse order. Sorting by date means balance assertions will
 still work if you reorder your entries.
 
+Also note the asserted balance must be a simple amount - it's not
+currently possible to assert a balance containing multiple commodities.
+
 The impact of balance assertions on parsing time for large files is
 not yet known.