diff --git a/docs/src/main/sphinx/functions.md b/docs/src/main/sphinx/functions.md
index 3478e1a92786..c445861ecce0 100644
--- a/docs/src/main/sphinx/functions.md
+++ b/docs/src/main/sphinx/functions.md
@@ -9,6 +9,11 @@ Refer to the following sections for further details:
 * [SQL data types and other general aspects](/language)
 * [SQL statement and syntax reference](/sql)
 
+In addition, Trino supports implementation of [custom
+functions](/develop/functions) or [custom table
+functions](/develop/table-functions) provided by a plugin, and creation of
+user-defined functions as [SQL routines](/routines).
+
 ## Functions by name
 
 If you are looking for a specific function or operator by name use
diff --git a/docs/src/main/sphinx/language/types.md b/docs/src/main/sphinx/language/types.md
index bf95d07ff3ba..c69c8202eb4d 100644
--- a/docs/src/main/sphinx/language/types.md
+++ b/docs/src/main/sphinx/language/types.md
@@ -1,7 +1,7 @@
 # Data types
 
-Trino has a set of built-in data types, described below.
-Additional types can be provided by plugins.
+Trino has a set of built-in data types, described below. Additional types can be
+[provided by plugins](/develop/types).
 
 (type-mapping-overview)=