diff --git a/src/monger/operators.clj b/src/monger/operators.clj
index d39f7f5..77d6cd4 100644
--- a/src/monger/operators.clj
+++ b/src/monger/operators.clj
@@ -188,4 +188,5 @@
 
 (defoperator $match)
 (defoperator $project)
-(defoperator $unwind)
\ No newline at end of file
+(defoperator $unwind)
+(defoperator $group)
\ No newline at end of file