diff --git a/NAMESPACE b/NAMESPACE
index a31c701..5f56d16 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -1,7 +1,6 @@
 # Generated by roxygen2: do not edit by hand
 
 S3method(plot,eyeris)
-export(baseline)
 export(bidsify)
 export(deblink)
 export(despeed)
@@ -10,5 +9,4 @@ export(epoch)
 export(interpolate)
 export(load)
 export(lpfilt)
-export(pca)
 export(zscore)
diff --git a/R/baseline.R b/R/baseline.R
index ab71dcb..fd10c98 100644
--- a/R/baseline.R
+++ b/R/baseline.R
@@ -1,14 +1,11 @@
-#' The length of a string
-#'
+#' Subtractive / divisive baselining of pupil data
+#' 
 #' todo: description goes here...
 #'
 #' @param eyeris An object of class `eyeris` dervived from [eyeris::load()].
 #'
 #' @return A numeric vector giving number of characters (code points) in each
 #'    element of the character vector. Missing string have missing length.
-#' @export
-#' @examples
-#' str_length(letters)
-baseline <- function(eyeris, extend = 0) {
+baseline <- function(eyeris) {
   ## TODO
 }
\ No newline at end of file
diff --git a/R/pca.R b/R/tpca.R
similarity index 74%
rename from R/pca.R
rename to R/tpca.R
index 8f6515c..6e97c70 100644
--- a/R/pca.R
+++ b/R/tpca.R
@@ -1,4 +1,4 @@
-#' The length of a string
+#' Temporal PCA
 #'
 #' todo: description goes here...
 #'
@@ -6,9 +6,6 @@
 #'
 #' @return A numeric vector giving number of characters (code points) in each
 #'    element of the character vector. Missing string have missing length.
-#' @export
-#' @examples
-#' str_length(letters)
-pca <- function(eyeris) {
+tpca <- function(eyeris) {
   ## TODO
 }
diff --git a/man/baseline.Rd b/man/baseline.Rd
index c7dc282..53c5f76 100644
--- a/man/baseline.Rd
+++ b/man/baseline.Rd
@@ -2,9 +2,9 @@
 % Please edit documentation in R/baseline.R
 \name{baseline}
 \alias{baseline}
-\title{The length of a string}
+\title{Subtractive / divisive baselining of pupil data}
 \usage{
-baseline(eyeris, extend = 0)
+baseline(eyeris)
 }
 \arguments{
 \item{eyeris}{An object of class \code{eyeris} dervived from \code{\link[=load]{load()}}.}
@@ -16,6 +16,3 @@ element of the character vector. Missing string have missing length.
 \description{
 todo: description goes here...
 }
-\examples{
-str_length(letters)
-}
diff --git a/man/pca.Rd b/man/tpca.Rd
similarity index 71%
rename from man/pca.Rd
rename to man/tpca.Rd
index 5601f9a..8c0ebb6 100644
--- a/man/pca.Rd
+++ b/man/tpca.Rd
@@ -1,10 +1,10 @@
 % Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/pca.R
-\name{pca}
-\alias{pca}
-\title{The length of a string}
+% Please edit documentation in R/tpca.R
+\name{tpca}
+\alias{tpca}
+\title{Temporal PCA}
 \usage{
-pca(eyeris)
+tpca(eyeris)
 }
 \arguments{
 \item{eyeris}{An object of class \code{eyeris} dervived from \code{\link[=load]{load()}}.}
@@ -16,6 +16,3 @@ element of the character vector. Missing string have missing length.
 \description{
 todo: description goes here...
 }
-\examples{
-str_length(letters)
-}