diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,8 @@
+Tasty-Tmux changelog
+--------------------
+
+0.1.0.2
+-------
+
+API changes:
+* A new constructor was added to the `Condition` to assert the inverse.
diff --git a/src/Test/Tasty/Tmux.hs b/src/Test/Tasty/Tmux.hs
--- a/src/Test/Tasty/Tmux.hs
+++ b/src/Test/Tasty/Tmux.hs
@@ -229,6 +229,7 @@
   = Unconditional
   | Substring B.ByteString
   | Regex B.ByteString
+  | Not Condition
   deriving (Show)
 
 -- | A captured pane.  For now this just contains the string content,
@@ -435,6 +436,7 @@
 checkCondition Unconditional = const True
 checkCondition (Substring s) = (s `B.isInfixOf`)
 checkCondition (Regex re) = (=~ re)
+checkCondition (Not cond) = not . checkCondition cond
 
 -- | Assert that the capture satisfies a condition
 assertCondition :: (MonadIO m) => Condition -> Capture -> m ()
diff --git a/tasty-tmux.cabal b/tasty-tmux.cabal
--- a/tasty-tmux.cabal
+++ b/tasty-tmux.cabal
@@ -1,5 +1,5 @@
 name:                tasty-tmux
-version:             0.1.0.1
+version:             0.1.0.2
 synopsis:            Terminal user acceptance testing (UAT) via tmux
 
 description:
@@ -17,8 +17,8 @@
 category:            Testing
 build-type:          Simple
 cabal-version:       >=1.10
-extra-source-files:
-  README.md
+extra-source-files:  README.md,
+                     CHANGELOG.md
 
 homepage:            https://github.com/purebred-mua/tasty-tmux
 bug-reports:         https://github.com/purebred-mua/tasty-tmux/issues