diff --git a/grudge/symbolic/primitives.py b/grudge/symbolic/primitives.py
index c59f1518b5034a9b69c3aca4a22c0c4bab92d7a6..63adf3dbf7bfa776f35a0691e63967488515fb00 100644
--- a/grudge/symbolic/primitives.py
+++ b/grudge/symbolic/primitives.py
@@ -76,6 +76,7 @@ Symbols
 .. autoclass:: ScalarVariable
 .. autoclass:: make_sym_array
 .. autoclass:: make_sym_mv
+.. autoclass:: FunctionSymbol
 
 .. function :: sqrt(arg)
 .. function :: exp(arg)