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-rw-r--r--doc/user/prg_erro4
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diff --git a/doc/user/prg_erro b/doc/user/prg_erro
index a5a19fa..ee4d784 100644
--- a/doc/user/prg_erro
+++ b/doc/user/prg_erro
@@ -5,6 +5,10 @@
@PP
In order to understand the error messages produced by program
printing, it is necessary to understand that Lout's first step when
+programs. @RawIndex { programs }
+programs.errors @SubIndex { errors }
+errors. @RawIndex { errors }
+errors.in.programs @SubIndex { in program formatting }
given a program text is to pass it to the separate {@Code prg2lout}
program for analysis. This separate program is the source of most
of the error messages associated with program printing.