diff --git a/doc_src/fish_for_bash_users.rst b/doc_src/fish_for_bash_users.rst
index f2b9dfb8b..c462c7f2c 100644
--- a/doc_src/fish_for_bash_users.rst
+++ b/doc_src/fish_for_bash_users.rst
@@ -216,7 +216,6 @@ Fish has a POSIX-compatible ``test`` or ``[`` builtin. There is no ``[[`` and ``
 
 Arithmetic Expansion
 --------------------
--
 
 Fish does not have ``$((i+1))`` arithmetic expansion, computation is handled by :ref:`math <cmd-math>`::
 
@@ -227,6 +226,11 @@ It can handle floating point numbers::
   > math 5 / 2
   2.5
 
+And also hase some functions, like for trigonometry::
+
+  > math cos 2 x pi
+  1
+
 Prompts
 -------