diff --git a/src/common/p25/dfsi/frames/MotPDUFrame.cpp b/src/common/p25/dfsi/frames/MotPDUFrame.cpp
index 8ed36bca..eb79ee9f 100644
--- a/src/common/p25/dfsi/frames/MotPDUFrame.cpp
+++ b/src/common/p25/dfsi/frames/MotPDUFrame.cpp
@@ -60,7 +60,7 @@ MotPDUFrame::~MotPDUFrame()
         delete[] pduHeaderData;
 }
 
-/* Decode a TSBK frame. */
+/* Decode a PDU frame. (only the PDU data header...) */
 
 bool MotPDUFrame::decode(const uint8_t* data)
 {
@@ -84,7 +84,7 @@ bool MotPDUFrame::decode(const uint8_t* data)
     return true;
 }
 
-/* Encode a TSBK frame. */
+/* Encode a PDU frame. (only the PDU data header...) */
 
 void MotPDUFrame::encode(uint8_t* data)
 {
@@ -100,7 +100,7 @@ void MotPDUFrame::encode(uint8_t* data)
         ::memcpy(data + 1U, buffer + 1U, 4U);
     }
 
-    // encode TSBK - scope is intentional
+    // encode PDU - scope is intentional
     {
         data[0U] = DFSIFrameType::PDU;
         ::memcpy(data + 9U, pduHeaderData, P25_PDU_HEADER_LENGTH_BYTES);
diff --git a/src/common/p25/dfsi/frames/MotPDUFrame.h b/src/common/p25/dfsi/frames/MotPDUFrame.h
index 1cb14868..4280d15a 100644
--- a/src/common/p25/dfsi/frames/MotPDUFrame.h
+++ b/src/common/p25/dfsi/frames/MotPDUFrame.h
@@ -72,12 +72,12 @@ namespace p25
                 ~MotPDUFrame();
 
                 /**
-                 * @brief Decode a PDU frame.
+                 * @brief Decode a PDU frame. (only the PDU data header...)
                  * @param[in] data Buffer to containing MotPDUFrame to decode.
                  */
                 bool decode(const uint8_t* data);
                 /**
-                 * @brief Encode a TSBK frame.
+                 * @brief Encode a PDU frame. (only the PDU data header...)
                  * @param[out] data Buffer to encode a MotPDUFrame.
                  */
                 void encode(uint8_t* data);