diff --git a/README.md b/README.md
index bbac630..af2afb2 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ file renamer or with a complex regular expression for matching and replacement.
     RR.exe file-match search replace [/p] [/r] [/f] [/e] [/files] [/dirs]
         /p: pretend (show what will be renamed)
         /r: recursive
+        /c: case insensitive
         /f: force overwrite if the file already exists
         /e: preserve file extensions
     /files: include only files
@@ -52,12 +53,12 @@ Rename files and directories
 # Version History
 
 * v1.0 - 2012-01-30: Initial release
-* v1.1 - 2012-12-15: Added /r option
-* v1.2 - 2013-05-11: Allow /p and /r options before or after main arguments
-* v1.3 - 2013-10-23: Added /f option
-* v1.4 - 2018-04-06: Added /e option (via Marcel Peeters)
+* v1.1 - 2012-12-15: Added `/r` option
+* v1.2 - 2013-05-11: Allow `/p` and `/r` options before or after main arguments
+* v1.3 - 2013-10-23: Added `/f` option
+* v1.4 - 2018-04-06: Added `/e` option (via Marcel Peeters)
 * v1.5 - 2020-07-02: Added support for directories, added length-check (via Alec S. @Synetech)
-* v1.6 - 2021-05-22: Added /i support for case insensitivity (via Alec S. @Synetech)
+* v1.6 - 2021-05-22: Added `/c` support for case insensitivity (via Alec S. @Synetech)
 
 # Credits