diff --git a/SFEM/generateRF/generateRF.py b/SFEM/generateRF/generateRF.py
index d45adb7d4e19be7cd9f75b01012552ec98b57f10..9339d6fd94eb1005bbee839a0acedad61b36f1bf 100644
--- a/SFEM/generateRF/generateRF.py
+++ b/SFEM/generateRF/generateRF.py
@@ -32,7 +32,7 @@ if test=='cellRF':
   # assume X1, X2 to be normally distributed variables
   meanX = np.array([0.05])    # mean of variables
   stdX = np.array([0.01])       # std of variables
-  R0_XY = np.array([[1]])    # covariance matrix between parameters C_XY (tau=0)
+  R0_XY = np.array([[1]])    # correlation matrix between parameters C_XY (tau=0)
 elif test=='rnnRF':
   mechDir='../rnnRF' # mechanical folder and file
   nDim = 3            # no. dimensions
@@ -41,7 +41,7 @@ elif test=='rnnRF':
   meanX = np.array([0.5,10])    # mean of variables
   stdX = np.array([0.05,0.1])       # std of variables
   rho = 0.2
-  R0_XY = np.array([[1, rho], [rho, 1]])    # covariance matrix between parameters C_XY (tau=0)
+  R0_XY = np.array([[1, rho], [rho, 1]])    # correlation matrix between parameters C_XY (tau=0)
 
 Nsim =10 #number of random fields to generate
 Gaussian=0