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-rw-r--r--doc/info/chap/overview.texinfo13
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+@node Invoking
+@chapter Invoking
+
+@command{learn-your-telephone-number} takes exactly one
+argument: your telephone number. It will ask you to enter
+it --- so you should not invoke @command{learn-your-telephone-number}
+directly.
+
+If the telephone number you enters matches the specified
+number, the program will exit with status 0. If they do
+not match, the program will show the difference and exit
+with status 1.
+
+On failure the program exits with status 2.
+
diff --git a/doc/info/chap/overview.texinfo b/doc/info/chap/overview.texinfo
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+@node Overview
+@chapter Overview
+
+@command{learn-your-telephone-number} is a simple command
+that can be used to force yourself learn your telephone
+number, or any sequence of digits.
+
+@command{learn-your-telephone-number} recognises @code{+}
+as an alias for @code{00}. All other non-digits are ignored.
+
+It is recommended to make your shell sometimes when opened,
+starts this program. Or when you log in on your laptop.
+