diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9b8eff0..4761b540 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 All major and minor version changes will be documented in this file. Details of patch-level version changes can be found in [commit messages](https://github.com/gchq/CyberChef/commits/master).
 
 
+### [8.21.0] - 2019-01-10
+- 'To Case Insensitive Regex' and 'From Case Insensitive Regex' operations added [@masq] | [#461]
+
 ### [8.20.0] - 2019-01-09
 - 'Generate Lorem Ipsum' operation added [@klaxon1] | [#455]
 
@@ -91,6 +94,7 @@ All major and minor version changes will be documented in this file. Details of
 
 
 
+[8.21.0]: https://github.com/gchq/CyberChef/releases/tag/v8.21.0
 [8.20.0]: https://github.com/gchq/CyberChef/releases/tag/v8.20.0
 [8.19.0]: https://github.com/gchq/CyberChef/releases/tag/v8.19.0
 [8.18.0]: https://github.com/gchq/CyberChef/releases/tag/v8.18.0
@@ -134,6 +138,7 @@ All major and minor version changes will be documented in this file. Details of
 [@tcode2k16]: https://github.com/tcode2k16
 [@Cynser]: https://github.com/Cynser
 [@anthony-arnold]: https://github.com/anthony-arnold
+[@masq]: https://github.com/masq
 
 [#95]: https://github.com/gchq/CyberChef/pull/299
 [#173]: https://github.com/gchq/CyberChef/pull/173
@@ -165,3 +170,4 @@ All major and minor version changes will be documented in this file. Details of
 [#449]: https://github.com/gchq/CyberChef/pull/449
 [#455]: https://github.com/gchq/CyberChef/pull/455
 [#458]: https://github.com/gchq/CyberChef/pull/458
+[#461]: https://github.com/gchq/CyberChef/pull/461
diff --git a/src/core/operations/FromCaseInsensitiveRegex.mjs b/src/core/operations/FromCaseInsensitiveRegex.mjs
index 2448c5e5..36cd9b14 100644
--- a/src/core/operations/FromCaseInsensitiveRegex.mjs
+++ b/src/core/operations/FromCaseInsensitiveRegex.mjs
@@ -19,7 +19,7 @@ class FromCaseInsensitiveRegex extends Operation {
 
         this.name = "From Case Insensitive Regex";
         this.module = "Default";
-        this.description = "Converts a case-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case /i wasn't available at the time but now is, or you need it to be case-sensitive again.";
+        this.description = "Converts a case-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case the i flag wasn't available at the time but now is, or you need it to be case-sensitive again.<br><br>e.g. <code>[mM][oO][zZ][iI][lL][lL][aA]/[0-9].[0-9] .*</code> becomes <code>Mozilla/[0-9].[0-9] .*</code>";
         this.infoURL = "https://wikipedia.org/wiki/Regular_expression";
         this.inputType = "string";
         this.outputType = "string";
diff --git a/src/core/operations/ToCaseInsensitiveRegex.mjs b/src/core/operations/ToCaseInsensitiveRegex.mjs
index 32fb96c7..0d606a05 100644
--- a/src/core/operations/ToCaseInsensitiveRegex.mjs
+++ b/src/core/operations/ToCaseInsensitiveRegex.mjs
@@ -19,7 +19,7 @@ class ToCaseInsensitiveRegex extends Operation {
 
         this.name = "To Case Insensitive Regex";
         this.module = "Default";
-        this.description = "Converts a case-sensitive regex string into a case-insensitive regex string in case /i flag is unavailable to you.";
+        this.description = "Converts a case-sensitive regex string into a case-insensitive regex string in case the i flag is unavailable to you.<br><br>e.g. <code>Mozilla/[0-9].[0-9] .*</code> becomes <code>[mM][oO][zZ][iI][lL][lL][aA]/[0-9].[0-9] .*</code>";
         this.infoURL = "https://wikipedia.org/wiki/Regular_expression";
         this.inputType = "string";
         this.outputType = "string";