diff --git a/doc/private/bugfix-by-assertion b/doc/private/bugfix-by-assertion
new file mode 100644
index 0000000000..35e45e5023
--- /dev/null
+++ b/doc/private/bugfix-by-assertion
@@ -0,0 +1,11 @@
+9.1.1rc2: 
+resolver.c:1733: REQUIRE((((fctx->queries).head == 0) ? isc_boolean_true : isc_boolean_false))	????
+
+9.1.3:
+mem.c:860: REQUIRE(ctx->references == 1)	OPEN 1523
+task.c:393: VALID_TASK(task))			OPEN 1538
+rbtdb.c:735: INSIST(node->references != 0)	OPEN 1581 1618
+zt.c:140: REQUIRE(VALID_ZT(zt))			OPEN 1587
+
+9.2.0rc1:
+rbtdb.c:740: INSIST(node->references != 0)	OPEN 1581 1618