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diff --git a/src/ChangeLog b/src/ChangeLog
index 8bd4426781d..5518531bea8 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,14 @@
+2011-05-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+        * data.c: Avoid integer truncation in expressions involving floats.
+        * data.c: Include <intprops.h>.
+        (arith_driver): When there's an integer overflow in an expression
+        involving floating point, convert the integers to floating point
+        so that the resulting value does not suffer from catastrophic
+        integer truncation.  For example, on a 64-bit host (* 4
+        most-negative-fixnum 0.5) should yield about -4.6e+18, not zero.
+        Do not rely on undefined behavior after integer overflow.
+
 2011-05-20  Paul Eggert  <eggert@cs.ucla.edu>
 
         merge count_size_as_multibyte, parse_str_to_multibyte