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diff --git a/src/data/value.h b/src/data/value.h
index 90f85753..a28b1855 100644
--- a/src/data/value.h
+++ b/src/data/value.h
@@ -23,6 +23,11 @@
 #include <string.h>
 #include "xalloc.h"
 
+/* Maximum length of a "short" string, that is represented in
+   "union value" without a separate pointer.
+
+   This is an implementation detail of the "union value" code.
+   There is little reason for client code to use it. */
 #define MAX_SHORT_STRING 8
 
 /* A numeric or string value.