diff --git a/include/relay_chn.h b/include/relay_chn.h
index 1ed03a1..d69f1f7 100644
--- a/include/relay_chn.h
+++ b/include/relay_chn.h
@@ -63,6 +63,14 @@ esp_err_t relay_chn_register_listener(relay_chn_state_listener_t listener);
  */
 void relay_chn_unregister_listener(relay_chn_state_listener_t listener);
 
+/**
+ * @brief Return the text presentation of an state.
+ *
+ * @param state A state with type of relay_chn_state_t.
+ * @return char* The text presentation of the state. "UNKNOWN" if the state is not known.
+ */
+char *relay_chn_state_to_str(relay_chn_state_t state);
+
 #if CONFIG_RELAY_CHN_ENABLE_TILTING
 /**
  * @brief Get the default tilting sensitivity for the relay channel.
diff --git a/private_include/relay_chn_core.h b/private_include/relay_chn_core.h
index 1649099..86c704a 100644
--- a/private_include/relay_chn_core.h
+++ b/private_include/relay_chn_core.h
@@ -93,14 +93,6 @@ esp_err_t relay_chn_start_esp_timer_once(esp_timer_handle_t esp_timer, uint32_t
  */
 void relay_chn_update_state(relay_chn_ctl_t *chn_ctl, relay_chn_state_t new_state);
 
-/**
- * @brief Return the text presentation of an state.
- *
- * @param state A state with type of relay_chn_state_t.
- * @return char* The text presentation of the state. "UNKNOWN" if the state is not known.
- */
-char *relay_chn_state_str(relay_chn_state_t state);
-
 #if CONFIG_RELAY_CHN_COUNT > 1
 /**
  * @brief Check if the provided channel ID is valid.
diff --git a/src/relay_chn_core.c b/src/relay_chn_core.c
index 2d8fba8..8d3aeb9 100644
--- a/src/relay_chn_core.c
+++ b/src/relay_chn_core.c
@@ -471,7 +471,7 @@ char *relay_chn_cmd_str(relay_chn_cmd_t cmd)
     }
 }
 
-char *relay_chn_state_str(relay_chn_state_t state)
+char *relay_chn_state_to_str(relay_chn_state_t state)
 {
     switch (state) {
         case RELAY_CHN_STATE_IDLE:
diff --git a/src/relay_chn_ctl_multi.c b/src/relay_chn_ctl_multi.c
index d433fd5..4289836 100644
--- a/src/relay_chn_ctl_multi.c
+++ b/src/relay_chn_ctl_multi.c
@@ -5,6 +5,7 @@
  */
 
 #include "esp_check.h"
+#include "relay_chn.h"
 #include "relay_chn_priv_types.h"
 #include "relay_chn_core.h"
 #include "relay_chn_ctl.h"
@@ -92,8 +93,8 @@ esp_err_t relay_chn_ctl_get_state_all(relay_chn_state_t *states)
 char *relay_chn_ctl_get_state_str(uint8_t chn_id)
 {
     return relay_chn_is_channel_id_valid(chn_id)
-           ? relay_chn_state_str(s_chn_ctls[chn_id].state)
-           : relay_chn_state_str(RELAY_CHN_STATE_UNDEFINED);
+           ? relay_chn_state_to_str(s_chn_ctls[chn_id].state)
+           : relay_chn_state_to_str(RELAY_CHN_STATE_UNDEFINED);
 }
 
 
diff --git a/src/relay_chn_ctl_single.c b/src/relay_chn_ctl_single.c
index e242030..dcb3ac7 100644
--- a/src/relay_chn_ctl_single.c
+++ b/src/relay_chn_ctl_single.c
@@ -5,6 +5,7 @@
  */
 
 #include "esp_check.h"
+#include "relay_chn.h"
 #include "relay_chn_priv_types.h"
 #include "relay_chn_core.h"
 #include "relay_chn_ctl.h"
@@ -65,7 +66,7 @@ relay_chn_state_t relay_chn_ctl_get_state()
 
 char *relay_chn_ctl_get_state_str()
 {
-    return relay_chn_state_str(s_chn_ctl.state);
+    return relay_chn_state_to_str(s_chn_ctl.state);
 }
 
 void relay_chn_ctl_run_forward()
diff --git a/src/relay_chn_tilt.c b/src/relay_chn_tilt.c
index c9552ad..acb6c47 100644
--- a/src/relay_chn_tilt.c
+++ b/src/relay_chn_tilt.c
@@ -5,6 +5,7 @@
  */
 
 #include "esp_check.h"
+#include "relay_chn.h"
 #include "relay_chn_core.h"
 #include "relay_chn_output.h"
 #include "relay_chn_run_info.h"
@@ -184,7 +185,7 @@ static void relay_chn_tilt_issue_cmd(relay_chn_tilt_ctl_t *tilt_ctl, relay_chn_t
             break;
 
         default:
-            ESP_LOGD(TAG, "relay_chn_tilt_issue_cmd: Unexpected relay channel state: %s!", relay_chn_state_str(tilt_ctl->chn_ctl->state));
+            ESP_LOGD(TAG, "relay_chn_tilt_issue_cmd: Unexpected relay channel state: %s!", relay_chn_state_to_str(tilt_ctl->chn_ctl->state));
     }
 }