diff --git a/R/interpolate.R b/R/interpolate.R
index 78138f9..c1d4dc0 100644
--- a/R/interpolate.R
+++ b/R/interpolate.R
@@ -74,7 +74,7 @@ GeomPathInterpolate <- ggproto('GeomPathInterpolate', GeomPath,
 )
 #' Interpolate layer data
 #'
-#' @param A data.frame with data for a layer
+#' @param data A data.frame with data for a layer
 #'
 #' @return A similar data.frame with NA values interpolated
 #'
diff --git a/man/interpolateDataFrame.Rd b/man/interpolateDataFrame.Rd
index 33a90e5..f3ffad7 100644
--- a/man/interpolateDataFrame.Rd
+++ b/man/interpolateDataFrame.Rd
@@ -7,7 +7,7 @@
 interpolateDataFrame(data)
 }
 \arguments{
-\item{A}{data.frame with data for a layer}
+\item{data}{A data.frame with data for a layer}
 }
 \value{
 A similar data.frame with NA values interpolated