doc: add info about sed s/.../.../I modifier

diff --git a/editors/sed_summary.htm b/editors/sed_summary.htm
index decf69b27d6908a611a712969fd39aa532f55908..34e72b0f869d5f7ccb287b25637647dc944788a6 100644 (file)
--- a/editors/sed_summary.htm
+++ b/editors/sed_summary.htm
@@ -174,6 +174,9 @@ last pattern address specified.  The following flags can be specified:</p>
        <dd>Replace all instances of /<em>pattern</em>/ on each
        addressed line, not just the first instance.</p></dd>
 
+       <dt><b>I</b></dt>
+       <dd>Matching is case-insensitive.<p></p></dd>
+
        <dt><b>p</b></dt>
        <dd>Print the line if a successful substitution is done.  If several
        successful substitutions are done, multiple copies of the line will be