diff --git a/libs/freetdm/src/include/freetdm.h b/libs/freetdm/src/include/freetdm.h
index a418152251..1efe459032 100644
--- a/libs/freetdm/src/include/freetdm.h
+++ b/libs/freetdm/src/include/freetdm.h
@@ -667,9 +667,6 @@ FT_DECLARE(ftdm_status_t) ftdm_span_set_sig_status(ftdm_span_t *span, ftdm_signa
 /*! \brief Get span signaling status (ie: whether protocol layer is up or down) */
 FT_DECLARE(ftdm_status_t) ftdm_span_get_sig_status(ftdm_span_t *span, ftdm_signaling_status_t *status);
 
-/*! \brief Get span signaling status (ie: whether protocol layer is up or down) */
-FT_DECLARE(void) ftdm_channel_clear_detected_tones(ftdm_channel_t *ftdmchan);
-
 /*! 
  * \brief Set user private data in the channel
  *
@@ -1268,7 +1265,7 @@ FT_DECLARE(const char *) ftdm_channel_get_state_str(const ftdm_channel_t *channe
 FT_DECLARE(const char *) ftdm_channel_get_last_state_str(const ftdm_channel_t *channel);
 
 /*! \brief For display debugging purposes you can display this string which describes the history of the channel 
- *  \param The channel
+ *  \param channel The channel to get the history from
  *  \return History string for the channel. You must free the string with ftdm_free
  */
 FT_DECLARE(char *) ftdm_channel_get_history_str(const ftdm_channel_t *channel);
diff --git a/libs/freetdm/src/include/private/ftdm_core.h b/libs/freetdm/src/include/private/ftdm_core.h
index beee868633..8bdbdd60f8 100644
--- a/libs/freetdm/src/include/private/ftdm_core.h
+++ b/libs/freetdm/src/include/private/ftdm_core.h
@@ -595,6 +595,10 @@ FT_DECLARE(ftdm_status_t) ftdm_channel_queue_dtmf(ftdm_channel_t *ftdmchan, cons
 /* dequeue pending signals and notify the user via the span signal callback */
 FT_DECLARE(ftdm_status_t) ftdm_span_trigger_signals(const ftdm_span_t *span);
 
+/*! \brief clear the tone detector state */
+FT_DECLARE(void) ftdm_channel_clear_detected_tones(ftdm_channel_t *ftdmchan);
+
+
 /*!
   \brief Assert condition
 */