diff --git a/doc/src/workflow/action/group.md b/doc/src/workflow/action/group.md
index 82f2b24..0b6d388 100644
--- a/doc/src/workflow/action/group.md
+++ b/doc/src/workflow/action/group.md
@@ -30,7 +30,7 @@ Each selector is a **table** with only one of the following keys:
 * `condition`: An array of three elements: The *JSON pointer*, *the operator*, and the
   *operand*. The [JSON pointer](../../guide/concepts/json-pointers.md) references a
   specific portion of the directory's value. The operator may be `"<"`, `"<="`,
-  `"=="`, `">="`, or `">"`. Both operands **must** have the same data type. The element
+  `"=="`, `"!="`, `">="`, or `">"`. Both operands **must** have the same data type. The element
   referenced by each JSON pointer must be present in the value of **every** directory.
 * `all`: Array of conditions (see above). All conditions must be `true` for this selector
   to be `true`. `all` is evaluated with short-circuit logic. When an element in `all`
diff --git a/src/expr.rs b/src/expr.rs
index 9e40d16..b46c02e 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -64,6 +64,7 @@ pub(crate) fn evaluate_json_comparison(
         (Comparison::LessThan, Some(Ordering::Less)) => Some(true),
         (Comparison::LessThanOrEqualTo, Some(Ordering::Less | Ordering::Equal)) => Some(true),
         (Comparison::EqualTo, Some(Ordering::Equal)) => Some(true),
+        (Comparison::NotEqualTo, Some(Ordering::Less | Ordering::Greater)) => Some(true),
         (Comparison::GreaterThanOrEqualTo, Some(Ordering::Greater | Ordering::Equal)) => Some(true),
         (Comparison::GreaterThan, Some(Ordering::Greater)) => Some(true),
         (_, None) => None,
@@ -165,6 +166,22 @@ mod tests {
             evaluate_json_comparison(&Comparison::EqualTo, &Value::from(5), &Value::from(5)),
             Some(true)
         );
+        assert_eq!(
+            evaluate_json_comparison(&Comparison::NotEqualTo, &Value::from(5), &Value::from(10)),
+            Some(true)
+        );
+        assert_eq!(
+            evaluate_json_comparison(&Comparison::NotEqualTo, &Value::from(5), &Value::from(5)),
+            Some(false)
+        );
+        assert_eq!(
+            evaluate_json_comparison(
+                &Comparison::NotEqualTo,
+                &Value::from(5),
+                &Value::from("abcd")
+            ),
+            None
+        );
         assert_eq!(
             evaluate_json_comparison(
                 &Comparison::GreaterThanOrEqualTo,
diff --git a/src/workflow.rs b/src/workflow.rs
index 45368e8..3aade5b 100644
--- a/src/workflow.rs
+++ b/src/workflow.rs
@@ -186,6 +186,8 @@ pub enum Comparison {
     LessThanOrEqualTo,
     #[serde(rename(deserialize = "=="))]
     EqualTo,
+    #[serde(rename(deserialize = "!="))]
+    NotEqualTo,
     #[serde(rename(deserialize = ">="))]
     GreaterThanOrEqualTo,
     #[serde(rename(deserialize = ">"))]