diff --git a/doc_src/index.hdr.in b/doc_src/index.hdr.in
index 172779ab2..c85f7127e 100644
--- a/doc_src/index.hdr.in
+++ b/doc_src/index.hdr.in
@@ -135,11 +135,12 @@ these characters, so called escape sequences are provided. These are:
 - <code>'\\\<'</code>, escapes the less than character
 - <code>'\\\>'</code>, escapes the more than character
 - <code>'\\^'</code>, escapes the circumflex character
-- <code>'\\x<i>xx</i>'</code>, where <code><i>xx</i></code> is a hexadecimal number, escapes the ascii character with the specified value
+- <code>'\\x<i>xx</i>'</code>, where <code><i>xx</i></code> is a hexadecimal number, escapes the ascii character with the specified value. For example, \\x9 is the tab character.
 - <code>'\\X<i>xx</i>'</code>, where <code><i>xx</i></code> is a hexadecimal number, escapes a byte of data with the specified value. If you are using a mutibyte encoding, this can be used to enter invalid strings. Only use this if you know what you are doing.
-- <code>'\\<i>ooo</i>'</code>, where <code><i>ooo</i></code> is an octal number, escapes the ascii character with the specified value
-- <code>'\\u<i>xxxx</i>'</code>, where <code><i>xxxx</i></code> is a hexadecimal number, escapes the 16-bit unicode character with the specified value
-- <code>'\\U<i>xxxxxxxx</i>'</code>, where <code><i>xxxxxxxx</i></code> is a hexadecimal number, escapes the 32-bit unicode character with the specified value
+- <code>'\\<i>ooo</i>'</code>, where <code><i>ooo</i></code> is an octal number, escapes the ascii character with the specified value. For example, \\011 is the tab character.
+- <code>'\\u<i>xxxx</i>'</code>, where <code><i>xxxx</i></code> is a hexadecimal number, escapes the 16-bit unicode character with the specified value. For example, \\u9 is the tab character.
+- <code>'\\U<i>xxxxxxxx</i>'</code>, where <code><i>xxxxxxxx</i></code> is a hexadecimal number, escapes the 32-bit unicode character with the specified value. For example, \\U9 is the tab character.
+- <code>'\\c<i>x</i>'</code>, where <code><i>x</i></code> is a letter of the alphabet, escapes the control sequence generated by pressing the control key and the specified letter. For example, \\ci is the tab character
 
 \subsection redirects IO redirection
 
@@ -1423,7 +1424,6 @@ g++, javac, java, gcj, lpr, doxygen, whois)
 - Suspending and then resuming pipelines containing a builtin is broken. How should this be handled?
 - delete-word is broken on the commandline 'sudo update-alternatives --config x-'
 
-
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