diff --git a/plone/app/discussion/contentrules.py b/plone/app/discussion/contentrules.py
index 0dd6681..4f2b58e 100644
--- a/plone/app/discussion/contentrules.py
+++ b/plone/app/discussion/contentrules.py
@@ -1,8 +1,101 @@
 """ Content rules handlers
 """
-from plone.app.contentrules.handlers import execute
+from plone.app.discussion import PloneAppDiscussionMessageFactory as _
+
+
+try:
+    from plone.stringinterp.adapters import BaseSubstitution
+except ImportError:
+    class BaseSubstitution(object):
+        """ Fallback class if plone.stringinterp is not available
+        """
+        def __init__(self, context, **kwargs):
+            self.context = context
+
+try:
+    from plone.app.contentrules.handlers import execute
+except ImportError:
+    execute = lambda context, event: False
+
 
 def execute_comment(event):
     """ Execute comment content rules
     """
     execute(event.object, event)
+
+class CommentSubstitution(BaseSubstitution):
+    """ Comment string substitution
+    """
+    def __init__(self, context, **kwargs):
+        super(CommentSubstitution, self).__init__(context, **kwargs)
+        self._session = None
+
+    @property
+    def session(self):
+        """ User session
+        """
+        if self._session is None:
+            sdm = getattr(self.context, 'session_data_manager', None)
+            self._session = sdm.getSessionData(create=False) if sdm else {}
+        return self._session
+
+    @property
+    def comment(self):
+        """ Get changed inline comment
+        """
+        return self.session.get('comment', {})
+
+class Id(CommentSubstitution):
+    """ Comment id string substitution
+    """
+    category = _(u'Comments')
+    description = _(u'Comment id')
+
+    def safe_call(self):
+        """ Safe call
+        """
+        return self.comment.get('comment_id', u'')
+
+class Text(CommentSubstitution):
+    """ Comment text
+    """
+    category = _(u'Comments')
+    description = _(u'Comment text')
+
+    def safe_call(self):
+        """ Safe call
+        """
+        return self.comment.get('text', u'')
+
+class AuthorUserName(CommentSubstitution):
+    """ Comment author user name string substitution
+    """
+    category = _(u'Comments')
+    description = _(u'Comment author user name')
+
+    def safe_call(self):
+        """ Safe call
+        """
+        return self.comment.get('author_username', u'')
+
+class AuthorFullName(CommentSubstitution):
+    """ Comment author full name string substitution
+    """
+    category = _(u'Comments')
+    description = _(u'Comment author full name')
+
+    def safe_call(self):
+        """ Safe call
+        """
+        return self.comment.get('author_name', u'')
+
+class AuthorEmail(CommentSubstitution):
+    """ Comment author email string substitution
+    """
+    category = _(u'Comments')
+    description = _(u'Comment author email')
+
+    def safe_call(self):
+        """ Safe call
+        """
+        return self.comment.get('author_email', u'')
diff --git a/plone/app/discussion/contentrules.zcml b/plone/app/discussion/contentrules.zcml
index 8b8edc6..c3d1108 100644
--- a/plone/app/discussion/contentrules.zcml
+++ b/plone/app/discussion/contentrules.zcml
@@ -57,4 +57,40 @@
 
   </configure>
 
+  <!-- Content rules strings -->
+  <adapter
+    for="zope.interface.Interface"
+    provides="plone.stringinterp.interfaces.IStringSubstitution"
+    factory=".contentrules.Id"
+    name="comment_id"
+    />
+
+  <adapter
+    for="zope.interface.Interface"
+    provides="plone.stringinterp.interfaces.IStringSubstitution"
+    factory=".contentrules.Text"
+    name="comment_text"
+    />
+
+  <adapter
+    for="zope.interface.Interface"
+    provides="plone.stringinterp.interfaces.IStringSubstitution"
+    factory=".contentrules.AuthorUserName"
+    name="comment_user_id"
+    />
+
+  <adapter
+    for="zope.interface.Interface"
+    provides="plone.stringinterp.interfaces.IStringSubstitution"
+    factory=".contentrules.AuthorFullName"
+    name="comment_user_fullname"
+    />
+
+  <adapter
+    for="zope.interface.Interface"
+    provides="plone.stringinterp.interfaces.IStringSubstitution"
+    factory=".contentrules.AuthorEmail"
+    name="comment_user_email"
+    />
+
 </configure>
diff --git a/plone/app/discussion/events.py b/plone/app/discussion/events.py
index 31253b7..30d49a1 100644
--- a/plone/app/discussion/events.py
+++ b/plone/app/discussion/events.py
@@ -1,6 +1,7 @@
 """ Custom discussion events
 """
 from zope.interface import implements
+from plone.app.discussion.interfaces import IComment
 from plone.app.discussion.interfaces import IDiscussionEvent
 from plone.app.discussion.interfaces import ICommentAddedEvent
 from plone.app.discussion.interfaces import ICommentRemovedEvent
@@ -18,6 +19,17 @@ class DiscussionEvent(object):
         for key, value in kwargs.items():
             setattr(self, key, value)
 
+        # Add comment on session to easily define content-rules dynamic strings
+        sdm = getattr(context, 'session_data_manager', None)
+        session = sdm.getSessionData(create=True) if sdm else None
+
+        if session:
+            sessionComment = dict(
+                (field, getattr(comment, field, None)) for field in IComment
+                if not field.startswith('_')
+            )
+            session.set('comment', sessionComment)
+
 class CommentAddedEvent(DiscussionEvent):
     """ Event to be triggered when a Comment is added
     """