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diff --git a/API.md b/API.md
index 08220b7..e14f039 100644
--- a/API.md
+++ b/API.md
@@ -53,6 +53,14 @@ data.
       only parameter (has the data type of the entry data) and must
       return a formspec which is inserted in the Entry tab.
 
+#### Predefined values `build_formspec`
+For `build_formspec` you can either define your own function or use one
+of the following predefined functions:
+
+* `doc.entry_templates.text`: Expects entry data to be a string.
+  It will be inserted directly into the entry. Use “`\n`” to start a
+  new line.
+
 #### Return value
 Always `nil`.