diff --git a/docs/reference/library/symbols.md b/docs/reference/library/symbols.md
index 2e6f48cdb..967271f38 100644
--- a/docs/reference/library/symbols.md
+++ b/docs/reference/library/symbols.md
@@ -2,4 +2,5 @@ These two modules give names to symbols and emoji to make them easy to insert
 with a normal keyboard. Alternatively, you can also always directly enter
 Unicode symbols into your text and formulas. In addition to the symbols listed
 below, math mode defines `dif` and `Dif`. These are not normal symbol values
-because they also affect spacing and font style.
+because they also affect spacing and font style. Furthermore, you can define
+custom symbols with the constructor function of the [symbol]($symbol) type.