diff --git a/docs/05.PORT-API.md b/docs/05.PORT-API.md
index 70ecd955e..4974d54aa 100644
--- a/docs/05.PORT-API.md
+++ b/docs/05.PORT-API.md
@@ -105,7 +105,7 @@ Allow user to provide external buffer for jerry instance (which includes an isol
  *
  *Note:
  *    This port function will be called automatically by jerry-core
- *    wnen JERRY_ENABLE_EXTERNAL_CONTEXT is defined. If not, this function will never be called.
+ *    when JERRY_ENABLE_EXTERNAL_CONTEXT is defined. If not, this function will never be called.
  *
  * @return the pointer to the jerry instance.
  */