diff --git a/README.md b/README.md
index 394cb4d..52e6437 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1195 TILs and counting..._
+_1196 TILs and counting..._
 
 ---
 
@@ -340,6 +340,7 @@ _1195 TILs and counting..._
 ### GROQ
 
 - [Grab Values From An Array Of References](groq/grab-values-from-an-array-of-references.md)
+- [Include Type Of Operation In Webhook Response](groq/include-type-of-operation-in-webhook-response.md)
 
 ### Heroku
 
diff --git a/groq/include-type-of-operation-in-webhook-response.md b/groq/include-type-of-operation-in-webhook-response.md
new file mode 100644
index 0000000..310a0ea
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+++ b/groq/include-type-of-operation-in-webhook-response.md
@@ -0,0 +1,26 @@
+# Include Type Of Operation In Webhook Response
+
+When setting up a webhook in Sanity Studio, you can specify what types of
+operations you want to trigger the webhook: `create`, `update`, and `delete`.
+
+If you include all three for a webhook, then you'll probably want to know in
+your webhook handler which type of operation you're receiving.
+
+Webhooks are run in _Delta Mode_ which means that a collection of GROQ
+functions are available in the _filter_ and _projection_ blocks. These
+functions include
+[`delta::operation`](https://www.sanity.io/docs/groq-functions#a64594a50318).
+
+Here is what a projection using `delta::operation` might look like:
+
+```groq
+{
+  _id,
+  firstName,
+  lastName,
+  email,
+  'operation': delta::operation()
+}
+```
+
+This function can resolve to either `create`, `update`, or `delete`.