diff --git a/websocket-sharp/WebSocketFrame.cs b/websocket-sharp/WebSocketFrame.cs
index 38865b97..b2954030 100644
--- a/websocket-sharp/WebSocketFrame.cs
+++ b/websocket-sharp/WebSocketFrame.cs
@@ -426,8 +426,7 @@ Extended Payload Length: {7}
     private static WebSocketFrame processHeader (byte[] header)
     {
       if (header.Length != 2)
-        throw new WebSocketException (
-          "The header part of a frame cannot be read from the data source.");
+        throw new WebSocketException ("The header of a frame cannot be read from the stream.");
 
       // FIN
       var fin = (header[0] & 0x80) == 0x80 ? Fin.Final : Fin.More;
@@ -450,7 +449,6 @@ Extended Payload Length: {7}
       // Payload Length
       var payloadLen = (byte) (header[1] & 0x7f);
 
-      // Check if valid header.
       var err = !opcode.IsSupported ()
                 ? "An unsupported opcode."
                 : !opcode.IsData () && rsv1 == Rsv.On
@@ -487,7 +485,7 @@ Extended Payload Length: {7}
       var bytes = stream.ReadBytes (len);
       if (bytes.Length != len)
         throw new WebSocketException (
-          "The 'Extended Payload Length' of a frame cannot be read from the data source.");
+          "The extended payload length of a frame cannot be read from the stream.");
 
       frame._extPayloadLength = bytes;
       return frame;
@@ -512,7 +510,7 @@ Extended Payload Length: {7}
         bytes => {
           if (bytes.Length != len)
             throw new WebSocketException (
-              "The 'Extended Payload Length' of a frame cannot be read from the data source.");
+              "The extended payload length of a frame cannot be read from the stream.");
 
           frame._extPayloadLength = bytes;
           completed (frame);
@@ -541,8 +539,7 @@ Extended Payload Length: {7}
 
       var bytes = stream.ReadBytes (len);
       if (bytes.Length != len)
-        throw new WebSocketException (
-          "The 'Masking Key' of a frame cannot be read from the data source.");
+        throw new WebSocketException ("The masking key of a frame cannot be read from the stream.");
 
       frame._maskingKey = bytes;
       return frame;
@@ -567,7 +564,7 @@ Extended Payload Length: {7}
         bytes => {
           if (bytes.Length != len)
             throw new WebSocketException (
-              "The 'Masking Key' of a frame cannot be read from the data source.");
+              "The masking key of a frame cannot be read from the stream.");
 
           frame._maskingKey = bytes;
           completed (frame);
@@ -583,11 +580,8 @@ Extended Payload Length: {7}
         return frame;
       }
 
-      // Check if allowable length.
       if (len > PayloadData.MaxLength)
-        throw new WebSocketException (
-          CloseStatusCode.TooBig,
-          "The length of 'Payload Data' of a frame is greater than the allowable max length.");
+        throw new WebSocketException (CloseStatusCode.TooBig, "A frame has a long payload length.");
 
       var llen = (long) len;
       var bytes = frame._payloadLength < 127
@@ -596,7 +590,7 @@ Extended Payload Length: {7}
 
       if (bytes.LongLength != llen)
         throw new WebSocketException (
-          "The 'Payload Data' of a frame cannot be read from the data source.");
+          "The payload data of a frame cannot be read from the stream.");
 
       frame._payloadData = new PayloadData (bytes, llen);
       return frame;
@@ -616,17 +610,14 @@ Extended Payload Length: {7}
         return;
       }
 
-      // Check if allowable length.
       if (len > PayloadData.MaxLength)
-        throw new WebSocketException (
-          CloseStatusCode.TooBig,
-          "The length of 'Payload Data' of a frame is greater than the allowable max length.");
+        throw new WebSocketException (CloseStatusCode.TooBig, "A frame has a long payload length.");
 
       var llen = (long) len;
       Action<byte[]> compl = bytes => {
         if (bytes.LongLength != llen)
           throw new WebSocketException (
-            "The 'Payload Data' of a frame cannot be read from the data source.");
+            "The payload data of a frame cannot be read from the stream.");
 
         frame._payloadData = new PayloadData (bytes, llen);
         completed (frame);