diff --git a/docs/en/query_language/agg_functions/parametric_functions.md b/docs/en/query_language/agg_functions/parametric_functions.md
index c72bfe26f7b..8784811a311 100644
--- a/docs/en/query_language/agg_functions/parametric_functions.md
+++ b/docs/en/query_language/agg_functions/parametric_functions.md
@@ -219,17 +219,19 @@ SELECT sequenceCount('(?1).*(?2)')(time, number = 1, number = 2) FROM t
 - [sequenceMatch](#function-sequencematch)
 
 
-## windowFunnel(window)(timestamp, cond1, cond2, cond3, ...)
+## windowFunnel(window, [mode])(timestamp, cond1, cond2, cond3, ...)
 
 Searches for event chains in a sliding time window and calculates the maximum number of events that occurred from the chain.
 
 ```
-windowFunnel(window)(timestamp, cond1, cond2, cond3, ...)
+windowFunnel(window, [mode])(timestamp, cond1, cond2, cond3, ...)
 ```
 
 **Parameters:**
 
 - `window` — Length of the sliding window in seconds.
+- `mode` - It is an optional argument.
+  * `'strict'` - When the `'strict'` is set, the windowFunnel() applies conditions only for the unique values.
 - `timestamp` — Name of the column containing the timestamp. Data types supported: `Date`, `DateTime`, and other unsigned integer types (note that even though timestamp supports the `UInt64` type, it's value can't exceed the Int64 maximum, which is 2^63 - 1).
 - `cond1`, `cond2`... — Conditions or data describing the chain of events. Data type: `UInt8`. Values can be 0 or 1.