diff --git a/reference/filter/filters.xml b/reference/filter/filters.xml
index 860df59fd4..3ab749062b 100644
--- a/reference/filter/filters.xml
+++ b/reference/filter/filters.xml
@@ -427,7 +427,7 @@
Regards inputs starting with 0x or
0X as hexadecimal numbers. This only allows
- succeeding characters to be a-hA-H0-9.
+ succeeding characters to be a-fA-F0-9.