diff --git a/doc/api.rst b/doc/api.rst
index c593b13f..d8bbb0db 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -155,7 +155,7 @@ For example::
       if (it != end && (*it == 'f' || *it == 'e')) presentation = *it++;
 
       // Check if reached the end of the range:
-      if (it != end && *it != '}') ctx.on_error("invalid format");
+      if (it != end && *it != '}') format_error("invalid format");
 
       // Return an iterator past the end of the parsed range:
       return it;