diff --git a/include/wx/propgrid/property.h b/include/wx/propgrid/property.h
index c88222fc22..01e2d07927 100644
--- a/include/wx/propgrid/property.h
+++ b/include/wx/propgrid/property.h
@@ -420,16 +420,16 @@ wxPG_PROP_USES_COMMON_VALUE         = 0x00020000,
 // See wxPGProperty::SetAutoUnspecified().
 wxPG_PROP_AUTO_UNSPECIFIED          = 0x00040000,
 
-// Indicates the bit useable by derived properties.
+// Indicates the bit usable by derived properties.
 wxPG_PROP_CLASS_SPECIFIC_1          = 0x00080000,
 
-// Indicates the bit useable by derived properties.
+// Indicates the bit usable by derived properties.
 wxPG_PROP_CLASS_SPECIFIC_2          = 0x00100000,
 
 // Indicates that the property is being deleted and should be ignored.
 wxPG_PROP_BEING_DELETED             = 0x00200000,
 
-// Indicates the bit useable by derived properties.
+// Indicates the bit usable by derived properties.
 wxPG_PROP_CLASS_SPECIFIC_3          = 0x00400000
 
 };
diff --git a/include/wx/propgrid/props.h b/include/wx/propgrid/props.h
index a8b549eb31..f2d9c531cc 100644
--- a/include/wx/propgrid/props.h
+++ b/include/wx/propgrid/props.h
@@ -594,7 +594,7 @@ protected:
 
 // -----------------------------------------------------------------------
 
-// Indicates first bit useable by derived properties.
+// Indicates first bit usable by derived properties.
 #define wxPG_PROP_SHOW_FULL_FILENAME  wxPG_PROP_CLASS_SPECIFIC_1
 
 // Like wxLongStringProperty, but the button triggers file selector instead.
diff --git a/interface/wx/propgrid/property.h b/interface/wx/propgrid/property.h
index c2e64ea810..32755d743a 100644
--- a/interface/wx/propgrid/property.h
+++ b/interface/wx/propgrid/property.h
@@ -360,12 +360,12 @@ wxPG_PROP_USES_COMMON_VALUE         = 0x00020000,
 */
 wxPG_PROP_AUTO_UNSPECIFIED          = 0x00040000,
 
-/** Indicates the bit useable by derived properties.
+/** Indicates the bit usable by derived properties.
     @hideinitializer
 */
 wxPG_PROP_CLASS_SPECIFIC_1          = 0x00080000,
 
-/** Indicates the bit useable by derived properties.
+/** Indicates the bit usable by derived properties.
     @hideinitializer
 */
 wxPG_PROP_CLASS_SPECIFIC_2          = 0x00100000,
@@ -375,7 +375,7 @@ wxPG_PROP_CLASS_SPECIFIC_2          = 0x00100000,
 */
 wxPG_PROP_BEING_DELETED             = 0x00200000
 
-/** Indicates the bit useable by derived properties.
+/** Indicates the bit usable by derived properties.
     @hideinitializer
 */
 wxPG_PROP_CLASS_SPECIFIC_3          = 0x00400000
diff --git a/interface/wx/propgrid/props.h b/interface/wx/propgrid/props.h
index a304e3926d..4ebe0a0c25 100644
--- a/interface/wx/propgrid/props.h
+++ b/interface/wx/propgrid/props.h
@@ -595,7 +595,7 @@ protected:
 };
 
 
-// Indicates first bit useable by derived properties.
+// Indicates first bit usable by derived properties.
 #define wxPG_PROP_SHOW_FULL_FILENAME  wxPG_PROP_CLASS_SPECIFIC_1
 
 /** @class wxFileProperty
diff --git a/src/gtk1/combobox.cpp b/src/gtk1/combobox.cpp
index cffc1d99c5..a4b0a82a65 100644
--- a/src/gtk1/combobox.cpp
+++ b/src/gtk1/combobox.cpp
@@ -230,7 +230,7 @@ bool wxComboBox::Create( wxWindow *parent, wxWindowID id, const wxString& value,
     combo->entry_change_id = gtk_signal_connect (GTK_OBJECT (combo->entry), "changed",
                   (GtkSignalFunc) gtk_dummy_callback, combo);
 
-    // make it more useable
+    // make it more usable
     gtk_combo_set_use_arrows_always( GTK_COMBO(m_widget), TRUE );
 
     // and case-sensitive