diff --git a/R/oa_snowball.R b/R/oa_snowball.R
index 117e0a4..8c85a31 100644
--- a/R/oa_snowball.R
+++ b/R/oa_snowball.R
@@ -36,6 +36,7 @@
 oa_snowball <- function(identifier = NULL,
                         ...,
                         id_type = c("short", "original"),
+                        options = list(),
                         mailto = oa_email(),
                         endpoint = "https://api.openalex.org",
                         verbose = FALSE,
@@ -45,6 +46,7 @@ oa_snowball <- function(identifier = NULL,
   base_args <- list(
     entity = "works",
     output = "tibble",
+    options = options,
     endpoint = endpoint,
     mailto = mailto,
     verbose = verbose
diff --git a/R/utils.R b/R/utils.R
index 8bf4878..16989e6 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -14,8 +14,7 @@ replace_w_na <- function(x){
   lapply(x, `%||%`, y = NA)
 }
 
-subs_na <- function(x, type = c("row_df", "col_df", "flat", "rbind_df", "identical"), prefix = NULL) {
-  type <- match.arg(type)
+subs_na <- function(x, type, prefix = NULL) {
   if (length(x) == 0) {
     return(NA)
   }
@@ -28,8 +27,7 @@ subs_na <- function(x, type = c("row_df", "col_df", "flat", "rbind_df", "identic
     row_df = as.data.frame(replace_w_na(x)),
     col_df = tibble::enframe(unlist(x)),
     flat = unlist(x),
-    rbind_df = do.call(rbind.data.frame, lapply(x, replace_w_na)
-    )
+    rbind_df = do.call(rbind.data.frame, lapply(x, replace_w_na))
   )
 
   if (!is.null(prefix)) {
diff --git a/man/oa_snowball.Rd b/man/oa_snowball.Rd
index ceaae95..14db982 100644
--- a/man/oa_snowball.Rd
+++ b/man/oa_snowball.Rd
@@ -9,6 +9,7 @@ oa_snowball(
   identifier = NULL,
   ...,
   id_type = c("short", "original"),
+  options = list(),
   mailto = oa_email(),
   endpoint = "https://api.openalex.org",
   verbose = FALSE,
@@ -28,6 +29,23 @@ for example, W2755950973.
 If "original", the OpenAlex IDs are kept as are,
 for example, https://openalex.org/W2755950973}
 
+\item{options}{List. Additional parameters to add in the query. For example:
+- `select` Character vector. Top-level fields to show in output.
+Defaults to NULL, which returns all fields.
+https://docs.openalex.org/how-to-use-the-api/get-single-entities/select-fields
+- `sort` Character. Attribute to sort by.
+For example: "display_name" for venues or "cited_by_count:desc" for works.
+See more at <https://docs.openalex.org/how-to-use-the-api/get-lists-of-entities/sort-entity-lists>.
+- `sample` Integer. Number of (random) records to return.
+Should be no larger than 10,000.
+Defaults to NULL, which returns all records satisfying the query.
+Read more at <https://docs.openalex.org/how-to-use-the-api/get-lists-of-entities/sample-entity-lists>.
+- `seed` Integer.
+A seed value in order to retrieve the same set of random records in
+the same order when used multiple times with `sample`.
+IMPORTANT NOTE: Depending on your query, random results with a seed value may change over time due to new records coming into OpenAlex.
+This argument is likely only useful when queries happen close together (within a day).}
+
 \item{mailto}{Character string.
 Gives OpenAlex an email to enter the polite pool.}