diff --git a/doc/stdlib/punctuation.rst b/doc/stdlib/punctuation.rst
index 0cdd88959f423..1e692e1e1a0ea 100644
--- a/doc/stdlib/punctuation.rst
+++ b/doc/stdlib/punctuation.rst
@@ -1,4 +1,3 @@
-
 Punctuation
 -----------
 
@@ -41,5 +40,6 @@ Extended documentation for mathematical symbols & functions is :ref:`here <mathe
    ``:``       index an entire dimension (1:end)
    ``::``      type annotation, depending on context
    ``:( )``    quoted expression
+   ``:a``      symbol a
    =========   ================================================