diff --git a/README.txt b/README.txt
index 59d1f17..00f27dc 100644
--- a/README.txt
+++ b/README.txt
@@ -34,7 +34,7 @@ Below is a simple example of RinRuby usage for simple linear regression. The sim
       R.x = (1..n).entries
       R.eval <<EOF
           set.seed(#{seed})
-          y <- {beta_0} + {beta_1}*x + rnorm({n})
+          y <- #{beta_0} + #{beta_1}*x + rnorm(#{n})
           fit <- lm( y ~ x )
           est <- round(coef(fit),3)
           pvalue <- summary(fit)$coefficients[2,4]