diff --git a/Web/coolprop/wrappers/MathCAD/MATHCAD15.rst b/Web/coolprop/wrappers/MathCAD/MATHCAD15.rst
index 8d14764c..554f5297 100644
--- a/Web/coolprop/wrappers/MathCAD/MATHCAD15.rst
+++ b/Web/coolprop/wrappers/MathCAD/MATHCAD15.rst
@@ -19,7 +19,7 @@ To Use
     
 * Copy CoolProp_EN.xml to C:\\Program Files (x86)\\Mathcad\\Mathcad 15\\doc\\funcdoc 
     
-* Open the CoolPropFluidProperties.xmcd file in MathCAD, all CoolProp functions should evaluate properly. If not, press <Ctrl>-F9 to force recalculation of the entire workbook.
+* Open the CoolPropFluidProperties.xmcdz file in MathCAD, all CoolProp functions should evaluate properly. If not, press <Ctrl>-F9 to force recalculation of the entire workbook.
 
 * CoolProp functions can be inserted from the Mathcad Insert Functions panel under the function category: CoolProp.  Input parameters and a brief description of each function will be shown.
 
@@ -68,6 +68,6 @@ To Use
     
 * Copy CoolProp\\wrapper\\Mathcad\\CoolProp_EN.xml to C:\\Program Files (x86)\\Mathcad\\Mathcad 15\\doc\\funcdoc 
     
-* Open the CoolPropFluidProperties.xmcd file in MathCAD, all CoolProp functions should evaluate properly. If not, press <Ctrl>-F9 to force recalculation of the entire workbook.
+* Open the CoolPropFluidProperties.xmcdz file in MathCAD, all CoolProp functions should evaluate properly. If not, press <Ctrl>-F9 to force recalculation of the entire workbook.
 
 * CoolProp functions can be inserted from the Mathcad Insert Functions panel under the function category: CoolProp.  Input parameters and a brief description of each function will be shown.
\ No newline at end of file