diff --git a/doc/fd.1 b/doc/fd.1
index 843d795..ba6ced1 100644
--- a/doc/fd.1
+++ b/doc/fd.1
@@ -233,6 +233,10 @@ path without file extension
 .IP {/.}
 basename without file extension
 .RE
+.SH PATTERN SYNTAX
+The
+.RI [ pattern ]
+syntax supported in the tool is documented at https://docs.rs/regex/1.0.0/regex/#syntax
 .SH ENVIRONMENT
 .TP
 .B LS_COLORS