(usage): Improve documentation along the lines suggested

by Debian 5.2.1-2.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/expr.c b/src/expr.c
index eac5cf17f..2ba533bc8 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -154,6 +154,11 @@ Comparisons are arithmetic if both ARGs are numbers, else lexicographical.\n\
 Pattern matches return the string matched between \\( and \\) or null; if\n\
 \\( and \\) are not used, they return the number of characters matched or 0.\n\
 "), stdout);
+      fputs (_("\
+\n\
+Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null\n\
+or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred.\n\
+"), stdout);
       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
     }
   exit (status);