diff --git a/docs/query-language.md b/docs/query-language.md
index b1315d293..365d7ded6 100644
--- a/docs/query-language.md
+++ b/docs/query-language.md
@@ -310,6 +310,12 @@ Return `{"attrs":{},"bits":[30]}`
 
 #### Xor
 
+**Spec:**
+
+```
+Xor(<BITMAP_CALL>, [BITMAP_CALL ...])
+```
+
 **Description:**
 
 Xor performs a logical XOR on the results of each `BITMAP_CALL` query passed to it.