diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ba501d67..251d1e5e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,21 +4,34 @@ FEATURES:
 
 IMPROVEMENTS:
 
-- commands/login: Add support for two-factor authentication [GH-8935]
-- commands/ssh-config: Properly display windows path if invoked from msys2 or cygwin [GH-8915]
-- guests/kali: Fix file permissions on guest plugin ruby files [GH-8950]
-- providers/salt: Remove duplicate stdout, stderr output from salt [GH-8767]
-- providers/salt: Introduce salt_call_args and salt_args option for salt provisioner [GH-8927]
+  - commands/login: Add support for two-factor authentication [GH-8935]
+  - commands/ssh-config: Properly display windows path if invoked from msys2 or cygwin [GH-8915]
+  - guests/kali: Fix file permissions on guest plugin ruby files [GH-8950]
+  - providers/salt: Remove duplicate stdout, stderr output from salt [GH-8767]
+  - providers/salt: Introduce salt_call_args and salt_args option for salt provisioner [GH-8927]
+  - provisioners/ansible(both): Add the compatibility_mode option, with auto-detection enabled by default [GH-8913, GH-6570]
+  - provisioners/ansible: Add the version option to the host-based provisioner [GH-8913, GH-8914]
+  - provisioners/ansible(both): Add the become and become_user options with deprecation of sudo and sudo_user options [GH-8913, GH-6570]
+  - provisioners/ansible: Add the ask_become_pass option with deprecation of the ask_sudo_pass option [GH-8913, GH-6570]
 
 BUG FIXES:
 
-- guests/shell_expand_guest_path : Properly expand guest paths that include relative path alias [GH-8918]
-- hosts/linux: Remove duplicate export folders before writing /etc/exports [GH-8945]
-- provisioners/ansible(both): Add single quotes to the inventory host variables, only when necessary [GH-8597]
-- provisioners/ansible(both): Add the "all:vars" section to the inventory when defined in `groups` option [GH-7730]
-- provisioners/ansible_local: Extra variables are no longer truncated when a dollar ($) character is present [GH-7735]
-- provisioners/file: Align file provisioner functionality on all platforms [GH-8939]
-- util/ssh: Properly quote key path for IdentityFile option to allow for spaces [GH-8924]
+  - guests/shell_expand_guest_path : Properly expand guest paths that include relative path alias [GH-8918]
+  - hosts/linux: Remove duplicate export folders before writing /etc/exports [GH-8945]
+  - provisioners/ansible(both): Add single quotes to the inventory host variables, only when necessary [GH-8597]
+  - provisioners/ansible(both): Add the "all:vars" section to the inventory when defined in `groups` option [GH-7730]
+  - provisioners/ansible_local: Extra variables are no longer truncated when a dollar ($) character is present [GH-7735]
+  - provisioners/file: Align file provisioner functionality on all platforms [GH-8939]
+  - util/ssh: Properly quote key path for IdentityFile option to allow for spaces [GH-8924]
+
+BREAKING CHANGES:
+
+  - Both Ansible provisioners are now capable of automatically setting the compatibility_mode that
+      best fits with the Ansible version in use. You may encounter some compatibility issues when
+      upgrading. If you were using Ansible 2.x and referring to the _ssh-prefixed variables present
+      in the generated inventory (e.g. `ansible_ssh_host`). In this case, you can fix your Vagrant
+      setup by setting compatibility_mode = "1.8", or by migrating to the new variable names (e.g.
+      ansible_host).
 
 ## 1.9.8 (August 23, 2017)