diff --git a/src/xrv/rvcorrel.x b/src/xrv/rvcorrel.x
index 5ec38df..fc992f9 100644
--- a/src/xrv/rvcorrel.x
+++ b/src/xrv/rvcorrel.x
@@ -13,7 +13,7 @@ include "rvfilter.h"
 # used as a working space.  Sign convention of this routine, if DATA1 lags 
 # DATA2, i.e. is shifted to the right of it, then ANS will show a peak at 
 # positive lags.
-# Referece:  Numerical Recipes in C, ch 12, Press, et al.
+# Reference:  Numerical Recipes in C, ch 12, Press, et al.
 
 procedure rv_correl (rv, data1, data2, npts, ans)