diff --git a/legacy/ecore/src/lib/ecore_imf/ecore_imf_context.c b/legacy/ecore/src/lib/ecore_imf/ecore_imf_context.c
index d99136af4c..0bb2354285 100644
--- a/legacy/ecore/src/lib/ecore_imf/ecore_imf_context.c
+++ b/legacy/ecore/src/lib/ecore_imf/ecore_imf_context.c
@@ -740,6 +740,8 @@ _ecore_imf_event_free_preedit(void *data __UNUSED__, void *event)
 /**
  * Adds ECORE_IMF_EVENT_PREEDIT_START to the event queue.
  *
+ * ECORE_IMF_EVENT_PREEDIT_START should be added when a new preedit sequence starts.
+ *
  * @param ctx An #Ecore_IMF_Context.
  * @ingroup Ecore_IMF_Context_Module_Group
  */
@@ -764,6 +766,8 @@ ecore_imf_context_preedit_start_event_add(Ecore_IMF_Context *ctx)
 /**
  * Adds ECORE_IMF_EVENT_PREEDIT_END to the event queue.
  *
+ * ECORE_IMF_EVENT_PREEDIT_END should be added when a new preedit sequence has been completed or canceled.
+ *
  * @param ctx An #Ecore_IMF_Context.
  * @ingroup Ecore_IMF_Context_Module_Group
  */
@@ -855,6 +859,10 @@ _ecore_imf_event_free_delete_surrounding(void *data __UNUSED__, void *event)
 /**
  * Adds ECORE_IMF_EVENT_DELETE_SURROUNDING to the event queue.
  *
+ * Asks the widget that the input context is attached to to delete characters around the cursor position 
+ * by adding the ECORE_IMF_EVENT_DELETE_SURROUNDING to the event queue.
+ * Note that offset and n_chars are in characters not in bytes.
+ *
  * @param ctx An #Ecore_IMF_Context.
  * @param offset The start offset of surrounding to be deleted.
  * @param n_chars The number of characters to be deleted.