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diff --git a/OPTIMIZATIONS b/OPTIMIZATIONS
index 3b6ebe1..51fcb32 100644
--- a/OPTIMIZATIONS
+++ b/OPTIMIZATIONS
@@ -151,3 +151,8 @@ tests lowtag.
 FAST-+/FIXNUM and similar should accept unboxed arguments in interests
 of representation selection. Problem: inter-TN dependencies.
 --------------------------------------------------------------------------------
+#14
+The derived type of (/ (THE (DOUBLE-FLOAT (0D0)) X) (THE (DOUBLE-FLOAT
+1D0) Y)) is (DOUBLE-FLOAT 0.0d0). While it might be reasonable, it is
+better to derive (DOUBLE-FLOAT (-0.0d0)).
+--------------------------------------------------------------------------------