Update field_presence.md
diff --git a/docs/field_presence.md b/docs/field_presence.md
index 03cedfd..ed76375 100644
--- a/docs/field_presence.md
+++ b/docs/field_presence.md
@@ -198,7 +198,7 @@
 
 ## How to enable _explicit presence_ in proto3
 
-These are the general steps to u field tracking support for proto3:
+These are the general steps to use field tracking support for proto3:
 
 1.  Add an `optional` field to a `.proto` file.
 1.  Run `protoc` (at least v3.15, or v3.12 using `--experimental_allow_proto3_optional` flag).