diff --git a/calculatorpp/res/values-ru/text_strings.xml b/calculatorpp/res/values-ru/text_strings.xml
index 925549dd..49abe69d 100644
--- a/calculatorpp/res/values-ru/text_strings.xml
+++ b/calculatorpp/res/values-ru/text_strings.xml
@@ -221,6 +221,7 @@
     <string name="prefs_graph_scren_title">Настройки графика</string>
 
     <string name="prefs_graph_interpolate_function">Интерполировать график</string>
+    <string name="prefs_graph_interpolate_function_summary">Если включено - при построении графика будет использована интерполяция</string>
     <string name="prefs_graph_real_color_title">Цвет вещественной части графика</string>
     <string name="prefs_graph_real_color_summary">Устанавливает цвет вещественной части графика</string>
     <string name="prefs_graph_imag_color_title">Цвет мнимой части графика</string>
diff --git a/calculatorpp/res/values/text_strings.xml b/calculatorpp/res/values/text_strings.xml
index 4d29b66f..c165fe46 100644
--- a/calculatorpp/res/values/text_strings.xml
+++ b/calculatorpp/res/values/text_strings.xml
@@ -221,6 +221,7 @@
     <string name="prefs_graph_scren_title">Graph preferences</string>
 
     <string name="prefs_graph_interpolate_function">Interpolate function\'s graph</string>
+    <string name="prefs_graph_interpolate_function_summary">If checked cubic interpolation will be used in function graph drawing</string>
     <string name="prefs_graph_real_color_title">Color of real part of functions graph</string>
     <string name="prefs_graph_real_color_summary">Sets color of real part functions graph</string>
     <string name="prefs_graph_imag_color_title">Color of imaginary part of functions graph</string>
diff --git a/calculatorpp/res/xml/plot_preferences.xml b/calculatorpp/res/xml/plot_preferences.xml
index f9796c35..104540c9 100644
--- a/calculatorpp/res/xml/plot_preferences.xml
+++ b/calculatorpp/res/xml/plot_preferences.xml
@@ -9,7 +9,7 @@
         <android.preference.CheckBoxPreference
                 a:key="graph_interpolate"
                 a:title="@string/prefs_graph_interpolate_function"
-                a:summary="If checked cubic interpolation will be used in function graph drawing"/>
+                a:summary="@string/prefs_graph_interpolate_function_summary"/>
 
         <ListPreference a:key="graph_line_color_real"
                         a:title="@string/prefs_graph_real_color_title"