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diff --git a/ChangeLog b/ChangeLog
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--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-04-14         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* builtin.c (do_sub): Improve some variable names for readability
+	and add / expand some comments.
+
 2015-04-14         Andrew J. Schorr      <aschorr@telemetry-investments.com>
 		   Arnold D. Robbins     <arnold@skeeve.com>