add more context

Co-authored-by: Alex Reinhart <[email protected]>

Author: nmdefries

facebook/delphiFacebook/R/responses.R

@@ -489,6 +489,10 @@ bodge_B13 <- function(input_data, wave) {
 
 #' Fix E1_* names in Wave 11 data after ~June 16, 2021.
 #' 
+#' Items E1_1 through E1_4 are part of a matrix. Qualtrics, for unknown reasons,
+#' switched to naming these E1_4 through E1_7 in June. Convert back to the
+#' intended names.
+#'
 #' @param input_data data frame of responses, before subsetting to select
 #'   variables
 #' @param wave integer indicating survey version