diff --git a/ChangeLog b/ChangeLog
index 5ca51b8..dbb851b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,10 @@
 ChangeLog
 ============
 
+- 0.26.0
+
+  - all WebSocketException provide message string (#152)
+
 - 0.25.0
 
   - fixed for Python 2.6(#151)
diff --git a/websocket/_app.py b/websocket/_app.py
index 160563c..c2d3c7d 100644
--- a/websocket/_app.py
+++ b/websocket/_app.py
@@ -96,7 +96,7 @@ class WebSocketApp(object):
         """
 
         if not self.sock or self.sock.send(data, opcode) == 0:
-            raise WebSocketConnectionClosedException()
+            raise WebSocketConnectionClosedException("Connection is already closed.")
 
     def close(self):
         """
@@ -164,7 +164,7 @@ class WebSocketApp(object):
                     break
                 if ping_timeout and self.last_ping_tm and time.time() - self.last_ping_tm > ping_timeout:
                     self.last_ping_tm = 0
-                    raise WebSocketTimeoutException()
+                    raise WebSocketTimeoutException("ping timed out")
 
                 if r:
                     op_code, frame = self.sock.recv_data_frame(True)
diff --git a/websocket/_core.py b/websocket/_core.py
index fb7bad0..c27ca14 100644
--- a/websocket/_core.py
+++ b/websocket/_core.py
@@ -952,7 +952,7 @@ class WebSocket(object):
                 self.sock.close()
             self.sock = None
             self.connected = False
-            raise WebSocketConnectionClosedException()
+            raise WebSocketConnectionClosedException("Connection is already closed.")
         return bytes
 
     def _recv_strict(self, bufsize):