diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index 41911240c65c47f48832f8fd645bedfd47eb12a4..37732a220d331dcbafbf49c1fb0b04fc0cb6edad 100644
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -187,9 +187,18 @@ The operators available for numeric fields are:
 
 And for string fields they are:
 
-==, !=
+==, !=, ~
 
-Currently, only exact string matches are supported.
+The glob (~) only accepts a wild card character (*) at the start and or
+end of the string. For example:
+
+  prev_comm ~ "*sh"
+  prev_comm ~ "sh*"
+  prev_comm ~ "*sh*"
+
+But does not allow for it to be within the string:
+
+  prev_comm ~ "ba*sh"   <-- is invalid
 
 5.2 Setting filters
 -------------------