diff --git a/docs/src/demos/Extensions/History/index.spec.js b/docs/src/demos/Extensions/History/index.spec.js
index e8f35871..79999b7f 100644
--- a/docs/src/demos/Extensions/History/index.spec.js
+++ b/docs/src/demos/Extensions/History/index.spec.js
@@ -10,6 +10,9 @@ context('/demos/Extensions/History', () => {
     cy.get('.ProseMirror')
       .should('contain', 'Mistake')
 
+    cy.get('button:first')
+      .should('not.have.attr', 'disabled')
+
     cy.get('button:first')
       .click()
 
@@ -68,12 +71,18 @@ context('/demos/Extensions/History', () => {
     cy.get('.ProseMirror')
       .should('contain', 'Mistake')
 
+    cy.get('button:first')
+      .should('not.have.attr', 'disabled')
+
     cy.get('button:first')
       .click()
 
     cy.get('.ProseMirror')
       .should('not.contain', 'Mistake')
 
+    cy.get('button:first')
+      .should('have.attr', 'disabled')
+
     cy.get('button:nth-child(2)')
       .click()
 
@@ -102,6 +111,9 @@ context('/demos/Extensions/History', () => {
     cy.get('button:nth-child(2)')
       .should('have.attr', 'disabled')
 
+    cy.get('button:first')
+      .should('not.have.attr', 'disabled')
+
     cy.get('button:first')
       .click()