diff --git a/src/index.js b/src/index.js
index 1a82a479..430fa989 100644
--- a/src/index.js
+++ b/src/index.js
@@ -101,9 +101,9 @@ const importIdentifier = '__ $YJS$ __'
 
 if (glo[importIdentifier] === true) {
   /**
-   * Dear reader of this warning message. Please take this seriously.
+   * Dear reader of this message. Please take this seriously.
    *
-   * If you see this message, please make sure that you only import one version of Yjs. In many cases,
+   * If you see this message, make sure that you only import one version of Yjs. In many cases,
    * your package manager installs two versions of Yjs that are used by different packages within your project.
    * Another reason for this message is that some parts of your project use the commonjs version of Yjs
    * and others use the EcmaScript version of Yjs.
@@ -112,6 +112,6 @@ if (glo[importIdentifier] === true) {
    * e.g. `struct instanceof GC`. If you imported different versions of Yjs, it is impossible for us to
    * do the constructor checks anymore - which might break the CRDT algorithm.
    */
-  console.warn('Yjs was already imported. Importing different versions of Yjs often leads to issues.')
+  console.error('Yjs was already imported. This breaks constructor checks and will lead to isssues!')
 }
 glo[importIdentifier] = true