diff --git a/content/docs/command-reference/params/index.md b/content/docs/command-reference/params/index.md
index 8d2fb58e6c..7878cb3c48 100644
--- a/content/docs/command-reference/params/index.md
+++ b/content/docs/command-reference/params/index.md
@@ -207,6 +207,7 @@ LIST = [1, 2, 3]
 SET = {4, 5, 6}
 TUPLE = (10, 100)
 NONE = None
+UNARY_OP = -1
 
 # Complex expressions will be ignored.
 DICT_EXP = dict(a=1, b=2)