+.B @hash
+Set by
+.BR dump-runlisp-image (1)
+to the hash
+(a string of hexadecimal digits)
+identifying the versions of the Lisp code included
+\(en or to be included \(en
+in a custom image.
+This is constructed by hashing the result of evaluating the
+.B lisp-version
+expression in the system definition.
+.
+.TP