diff --git a/docs/README.md b/docs/README.md
index f1550101..0e49ac8b 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -138,7 +138,7 @@ enum {
   MG_EV_RESOLVE,     // Host name is resolved        NULL
   MG_EV_CONNECT,     // Connection established       NULL
   MG_EV_ACCEPT,      // Connection accepted          NULL
-  MG_EV_READ,        // Data received from socket    struct mg_str *
+  MG_EV_READ,        // Data received from socket    long *bytes_read
   MG_EV_WRITE,       // Data written to socket       long *bytes_written
   MG_EV_CLOSE,       // Connection closed            NULL
   MG_EV_HTTP_MSG,    // HTTP request/response        struct mg_http_message *