diff --git a/hc128.cpp b/hc128.cpp
index 3d5be1cc..682344c5 100644
--- a/hc128.cpp
+++ b/hc128.cpp
@@ -228,8 +228,8 @@ void HC128Policy::OperateKeystream(KeystreamOperation operation, byte *output, c
 		//  then it will ask OperateKeystream to generate one. Optionally it
 		//  will ask for an XOR of the input with the keystream while
 		//  writing the result to the output buffer. In all cases the
-		//  output buffer is written. The optional part is adding the
-		//  input buffer and keystream.
+		//  keystream is written to the output buffer. The optional part is
+		//  adding the input buffer and keystream.
 		if ((operation & INPUT_NULL) != INPUT_NULL)
 			xorbuf(output, input, 64);
 
diff --git a/hc256.cpp b/hc256.cpp
index d7c47fd8..aa64c648 100644
--- a/hc256.cpp
+++ b/hc256.cpp
@@ -103,8 +103,8 @@ void HC256Policy::OperateKeystream(KeystreamOperation operation, byte *output, c
 	//  then it will ask OperateKeystream to generate one. Optionally it
 	//  will ask for an XOR of the input with the keystream while
 	//  writing the result to the output buffer. In all cases the
-	//  output buffer is written. The optional part is adding the
-	//  input buffer and keystream.
+	//  keystream is written to the output buffer. The optional part is
+	//  adding the input buffer and keystream.
 	if ((operation & INPUT_NULL) != INPUT_NULL)
 		xorbuf(output, input, msglen);
 }
diff --git a/rabbit.cpp b/rabbit.cpp
index 8bc4a499..ef146259 100644
--- a/rabbit.cpp
+++ b/rabbit.cpp
@@ -148,8 +148,8 @@ void RabbitPolicy::OperateKeystream(KeystreamOperation operation, byte *output,
 	//  then it will ask OperateKeystream to generate one. Optionally it
 	//  will ask for an XOR of the input with the keystream while
 	//  writing the result to the output buffer. In all cases the
-	//  output buffer is written. The optional part is adding the
-	//  input buffer and keystream.
+	//  keystream is written to the output buffer. The optional part is
+	//  adding the input buffer and keystream.
 	if ((operation & INPUT_NULL) != INPUT_NULL)
 		xorbuf(output, input, GetBytesPerIteration() * iterationCount);
 }
@@ -250,8 +250,8 @@ void RabbitWithIVPolicy::OperateKeystream(KeystreamOperation operation, byte *ou
 	//  then it will ask OperateKeystream to generate one. Optionally it
 	//  will ask for an XOR of the input with the keystream while
 	//  writing the result to the output buffer. In all cases the
-	//  output buffer is written. The optional part is adding the
-	//  input buffer and keystream.
+	//  keystream is written to the output buffer. The optional part is
+	//  adding the input buffer and keystream.
 	if ((operation & INPUT_NULL) != INPUT_NULL)
 		xorbuf(output, input, GetBytesPerIteration() * iterationCount);
 }