diff --git a/src/lib/ecore_wl2/ecore_wl2_input.c b/src/lib/ecore_wl2/ecore_wl2_input.c
index 27efce865a..c544a8940c 100644
--- a/src/lib/ecore_wl2/ecore_wl2_input.c
+++ b/src/lib/ecore_wl2/ecore_wl2_input.c
@@ -545,7 +545,7 @@ in this Software without prior written authorization from The Open Group.
          */
 
         if (((c >= '@') && (c <= '_')) || /* those are the one defined in C0 with capital letters */
-             ((c >= 'a') && (c <= 'z')) ||  /* the lowercase symbols (not part of the standard, but usefull */
+             ((c >= 'a') && (c <= 'z')) ||  /* the lowercase symbols (not part of the standard, but useful) */
               c == ' ')
           c &= 0x1F;
         else if (c == '\x7f')
@@ -569,7 +569,7 @@ in this Software without prior written authorization from The Open Group.
      }
    else
      {
-        /* if its not a control code, try to produce a usefull output */
+        /* if its not a control code, try to produce useful output */
         if (!xkb_keysym_to_utf8(keysym, buffer, bytes))
           return 0;
      }
diff --git a/src/lib/elementary/elm_widget.c b/src/lib/elementary/elm_widget.c
index 8bfcf22cc8..f07b6427f2 100644
--- a/src/lib/elementary/elm_widget.c
+++ b/src/lib/elementary/elm_widget.c
@@ -4186,7 +4186,7 @@ _elm_widget_efl_object_dbg_info_get(Eo *eo_obj, Elm_Widget_Smart_Data *_pd EINA_
 
      }
 
-   //if thats a focus manager, give usefull informations like the border elements
+   //if thats a focus manager, give useful information like the border elements
    if (efl_isa(eo_obj, EFL_UI_FOCUS_MANAGER_CLASS))
      {
         Efl_Dbg_Info *border;
diff --git a/src/lib/elput/elput_evdev.c b/src/lib/elput/elput_evdev.c
index fd02e2a634..7f2abd0d7c 100644
--- a/src/lib/elput/elput_evdev.c
+++ b/src/lib/elput/elput_evdev.c
@@ -535,7 +535,7 @@ in this Software without prior written authorization from The Open Group.
          */
 
         if (((c >= '@') && (c <= '_')) || /* those are the one defined in C0 with capital letters */
-             ((c >= 'a') && (c <= 'z')) ||  /* the lowercase symbols (not part of the standard, but usefull */
+             ((c >= 'a') && (c <= 'z')) ||  /* the lowercase symbols (not part of the standard, but useful) */
               c == ' ')
           c &= 0x1F;
         else if (c == '\x7f')
@@ -559,7 +559,7 @@ in this Software without prior written authorization from The Open Group.
      }
    else
      {
-        /* if its not a control code, try to produce a usefull output */
+        /* if its not a control code, try to produce useful output */
         if (!xkb_keysym_to_utf8(keysym, buffer, bytes))
           return 0;
      }