diff --git a/DESCRIPTION b/DESCRIPTION
index b440401..097309a 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: GPCERF
 Title: Gaussian Processes for Estimating Causal Exposure Response Curves
-Version: 0.2.1
+Version: 0.2.2
 Authors@R: c(
     person("Naeem", "Khoshnevis", email = "nkhoshnevis@g.harvard.edu",
            role=c("aut","cre"), 
@@ -38,7 +38,7 @@ Imports:
     wCorr
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.1
+RoxygenNote: 7.2.3
 Depends: 
     R (>= 3.5.0)
 Suggests: 
diff --git a/NEWS.md b/NEWS.md
index 0058b54..e470d57 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+# GPCERF 0.2.2 (2024-02-16)
+
+## Changed
+- `n_thread` -> `nthread` in `estimate_noise_nn` documentation.
+
+
 # GPCERF 0.2.1 (2023-01-15)
 
 ## Changed
diff --git a/R/estimate_noise_nn.R b/R/estimate_noise_nn.R
index 8890bd9..3b4dacb 100644
--- a/R/estimate_noise_nn.R
+++ b/R/estimate_noise_nn.R
@@ -11,7 +11,7 @@
 #' levels.
 #' @param y_obs A vector of observed outcomes.
 #' @param n_neighbor A number of nearest neighbors on one side.
-#' @param n_thread A number of cores used in the estimation.
+#' @param nthread A number of cores used in the estimation.
 #' @param kernel_fn The covariance function of the GP.
 #'
 #' @return
diff --git a/cran-comments.md b/cran-comments.md
new file mode 100644
index 0000000..cf2b68a
--- /dev/null
+++ b/cran-comments.md
@@ -0,0 +1,11 @@
+Submission (February 16, 2024):
+
+We appreciate your efforts in reviewing the GPCERF 0.2.2 package. In this upgrade, we:
+
+- Fixed a note raised in some of CRAN checks.
+
+All tests and checks have passed successfully.
+
+Best regards, 
+Naeem Khoshnevis 
+RCD - HUIT Harvard University
diff --git a/man/estimate_noise_nn.Rd b/man/estimate_noise_nn.Rd
index c268f37..a76386b 100644
--- a/man/estimate_noise_nn.Rd
+++ b/man/estimate_noise_nn.Rd
@@ -26,9 +26,9 @@ levels.}
 
 \item{n_neighbor}{A number of nearest neighbors on one side.}
 
-\item{kernel_fn}{The covariance function of the GP.}
+\item{nthread}{A number of cores used in the estimation.}
 
-\item{n_thread}{A number of cores used in the estimation.}
+\item{kernel_fn}{The covariance function of the GP.}
 }
 \value{
 A scalar of estimated standard deviation of the nugget term in nnGP.