diff --git a/R/ts-geometric-brownian-motion-augment.R b/R/ts-geometric-brownian-motion-augment.R
index 45f89c9..a3f0077 100644
--- a/R/ts-geometric-brownian-motion-augment.R
+++ b/R/ts-geometric-brownian-motion-augment.R
@@ -21,8 +21,8 @@
 #'
 #'      dS/S = mdt + sdW
 #'
-#' where S is the price of the asset, t is time, μ is the expected return on the
-#' asset, σ is the volatility of the asset, and dW is a small random change in
+#' where S is the price of the asset, t is time, m is the expected return on the
+#' asset, s is the volatility of the asset, and dW is a small random change in
 #' the asset's price.
 #'
 #' GBM can be used to estimate the likelihood of different outcomes for a given
diff --git a/R/ts-geometric-brownian-motion.R b/R/ts-geometric-brownian-motion.R
index 5c0a02d..62690ea 100644
--- a/R/ts-geometric-brownian-motion.R
+++ b/R/ts-geometric-brownian-motion.R
@@ -21,8 +21,8 @@
 #'
 #'      dS/S = mdt + sdW
 #'
-#' where S is the price of the asset, t is time, μ is the expected return on the
-#' asset, σ is the volatility of the asset, and dW is a small random change in
+#' where S is the price of the asset, t is time, m is the expected return on the
+#' asset, s is the volatility of the asset, and dW is a small random change in
 #' the asset's price.
 #'
 #' GBM can be used to estimate the likelihood of different outcomes for a given
diff --git a/man/ts_geometric_brownian_motion.Rd b/man/ts_geometric_brownian_motion.Rd
index 08bef80..eb62823 100644
--- a/man/ts_geometric_brownian_motion.Rd
+++ b/man/ts_geometric_brownian_motion.Rd
@@ -53,8 +53,8 @@ The equation for GBM is:
 \if{html}{\out{<div class="sourceCode">}}\preformatted{ dS/S = mdt + sdW
 }\if{html}{\out{</div>}}
 
-where S is the price of the asset, t is time, μ is the expected return on the
-asset, σ is the volatility of the asset, and dW is a small random change in
+where S is the price of the asset, t is time, m is the expected return on the
+asset, s is the volatility of the asset, and dW is a small random change in
 the asset's price.
 
 GBM can be used to estimate the likelihood of different outcomes for a given
diff --git a/man/ts_geometric_brownian_motion_augment.Rd b/man/ts_geometric_brownian_motion_augment.Rd
index 3506763..e7c708d 100644
--- a/man/ts_geometric_brownian_motion_augment.Rd
+++ b/man/ts_geometric_brownian_motion_augment.Rd
@@ -55,8 +55,8 @@ The equation for GBM is:
 \if{html}{\out{<div class="sourceCode">}}\preformatted{ dS/S = mdt + sdW
 }\if{html}{\out{</div>}}
 
-where S is the price of the asset, t is time, μ is the expected return on the
-asset, σ is the volatility of the asset, and dW is a small random change in
+where S is the price of the asset, t is time, m is the expected return on the
+asset, s is the volatility of the asset, and dW is a small random change in
 the asset's price.
 
 GBM can be used to estimate the likelihood of different outcomes for a given