diff --git a/R/spec_tools.R b/R/spec_tools.R
index bd27df4..f62f9e3 100644
--- a/R/spec_tools.R
+++ b/R/spec_tools.R
@@ -58,8 +58,8 @@
 #' @param begin Smallest degree to rotate. Default is 0
 #' @param end Largest degree to rotate. Default is 359.
 #' @export
-spec_angle <- function(x) {
-  x <- round(rescale(x, c(0, 359)))
+spec_angle <- function(x, begin, end) {
+  x <- round(rescale(x, c(begin, end)))
   x[is.na(x)] <- 0
   return(x)
 }