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diff --git a/api/api.md b/api/api.md
index 3af79d37..02ad054e 100644
--- a/api/api.md
+++ b/api/api.md
@@ -3905,6 +3905,31 @@ assert "hello world".ends_with("world", &remainder) == yes
 assert remainder == "hello "
 
 ```
+## Text.find
+
+```tomo
+Text.find : func(text: Text, target: Text, start: Int = 1 -> Int)
+```
+
+Find a substring within a text and return its index, if found.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+text | `Text` | The text to be searched.  | -
+target | `Text` | The target text to find.  | -
+start | `Int` | The index at which to begin searching.  | `1`
+
+**Return:** The index where the first occurrence of `target` appears, or `none` if it is not found.
+
+
+**Example:**
+```tomo
+assert "one two".find("one") == 1
+assert "one two".find("two") == 5
+assert "one two".find("three") == none
+assert "one two".find("o", start=2) == 7
+
+```
 ## Text.from
 
 ```tomo