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diff --git a/src/ChangeLog b/src/ChangeLog
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--- a/src/ChangeLog
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@@ -1,3 +1,13 @@
+2014-08-03  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Avoid undefined behavior with signed left shift.
+        Caught by 'gcc -fsanitize=undefined'.
+        * dispextern.h, scroll.c (scrolling_max_lines_saved, scrolling_1):
+        * dispnew.c (line_hash_code, scrolling):
+        * scroll.c (calculate_scrolling, calculate_direct_scrolling):
+        Use 'unsigned', not 'int', for line hashes.
+        (scrolling_max_lines_saved): Avoid mystery constants for hash sizes.
+
 2014-08-02  Paul Eggert  <eggert@cs.ucla.edu>
 
         Make compare-strings more compatible with old behavior (Bug#17903).