diff --git a/app/assets/javascripts/components/features/compose/components/compose_form.jsx b/app/assets/javascripts/components/features/compose/components/compose_form.jsx
index 273ebd83f3..166c5fdced 100644
--- a/app/assets/javascripts/components/features/compose/components/compose_form.jsx
+++ b/app/assets/javascripts/components/features/compose/components/compose_form.jsx
@@ -173,6 +173,13 @@ const ComposeForm = React.createClass({
           <Toggle checked={this.props.private} onChange={this.handleChangeVisibility} />
           <span className='compose-form__label__text'><FormattedMessage id='compose_form.private' defaultMessage='Mark as private' /></span>
         </label>
+       
+        <Motion defaultStyle={{ opacity: 0, height: 0 }}, style={{ opacity: spring((this.props.private || reply_to_other) ? 0 : 100), height: spring((this.props.private || reply_to_other) ? 0 : 39.5) }}>
+            <label className='compose-form__label' style={{ height: `${height}px`, overflow: 'hidden', opacity: opacity / 100 }}>
+              <span className='compose-form__label__text'><FormattedMessage id='compose_form.privacy_disclaimer' defaultMessage='Warning: Private posts are not encrypted, and could be read or boosted by instances or people who do not respect post privacy. This is not true privacy. Do not post senstive information.' /></span>
+            </label>
+          }
+        </Motion>
 
         <Collapsable isVisible={!(this.props.private || reply_to_other)} fullHeight={39.5}>
           <label className='compose-form__label'>
diff --git a/app/assets/javascripts/components/locales/en.jsx b/app/assets/javascripts/components/locales/en.jsx
index ac1c1a7d53..d1357227e5 100644
--- a/app/assets/javascripts/components/locales/en.jsx
+++ b/app/assets/javascripts/components/locales/en.jsx
@@ -41,6 +41,7 @@ const en = {
   "compose_form.sensitive": "Mark media as sensitive",
   "compose_form.spoiler": "Hide text behind warning",
   "compose_form.private": "Mark as private",
+  "compose_form.privacy_disclaimer": "Warning: Private posts are not encrypted, and could be read or boosted by instances or people who do not respect post privacy. This is not true privacy. Do not post senstive information."
   "compose_form.unlisted": "Do not display in public timeline",
   "navigation_bar.edit_profile": "Edit profile",
   "navigation_bar.preferences": "Preferences",