diff --git a/app/models/station.server.ts b/app/models/station.server.ts
index aef8c15..9ac5080 100644
--- a/app/models/station.server.ts
+++ b/app/models/station.server.ts
@@ -17,6 +17,9 @@ export type StationInput = {
 
 export type PrismaTxClient = Omit<PrismaClient, "$connect" | "$disconnect" | "$on" | "$transaction" | "$use">;
 
+/**
+ * Fetch stations with a reliability score GTE to the `reliability` parameter.
+ */
 export function getStations(reliability: number = 80) {
     return prisma.station.findMany({
         where: { reliability: { gte: reliability } },
@@ -34,7 +37,9 @@ export function getStations(reliability: number = 80) {
     });
 }
 
-
+/**
+ * Fetch stations tagged with `tags` and a reliability score GTE to the `reliability` parameter.
+ */
 export function findStationsByTags(tags: string[], reliability: number = 80) {
     return prisma.station.findMany({
         where: {
@@ -78,14 +83,22 @@ export function getStationById(id: string) {
 
 }
 
+/**
+ * Performs upsert at the DB level with `ON CONFLICT`.  This is much faster than application level checks, which would require
+ * several queries.
+ * Note: certain criteria must be met to perform at the DB level.
+ * For details, see https://www.prisma.io/docs/reference/api-reference/prisma-client-reference#database-upsert-query-criteria
+ */
 export function upsertStationOnStreamUrl(input: StationInput, p: PrismaTxClient = prisma) {
     return p.station.upsert({
+        // only one unique field in the upsert's where option
         where: { streamUrl: input.streamUrl },
         create: {
             name: input.name,
             slug: slugify(input.name),
             description: input.description,
             imgUrl: input.imgUrl,
+            // unique field in the where option and the unique field in the create option have the same value
             streamUrl: input.streamUrl,
             reliability: input.reliability,
             popularity: input.popularity
@@ -114,6 +127,15 @@ export function createStationTag(station: Station, tag: Tag, p: PrismaTxClient =
     });
 }
 
+/**
+ * Import the stations in `stationsInput` by either inserting or updating the records.
+ * - stations are upserted with uniqueness constraint on `streamUrl`
+ * - tags are upserted with uniqueness constraint on `name`
+ * - station tags are set by removing and then adding tags from each `stationInput`.
+ * - we may need to revisit this approach on station tags for performance and functional
+ *   requirements
+ * - all writes are performed in a single transaction for performance and correctness.
+ */
 export async function importStations(stationsInput: StationInput[]) {
     return prisma.$transaction(async (tx) => {
         const stations: Station[] = [];
diff --git a/app/models/tag.server.ts b/app/models/tag.server.ts
index 361c66d..9fe7771 100644
--- a/app/models/tag.server.ts
+++ b/app/models/tag.server.ts
@@ -50,6 +50,12 @@ export function getTags(reliability = 80) {
     });
 }
 
+/**
+ * Performs upsert at the DB level with `ON CONFLICT`.  This is much faster than application level checks, which would require
+ * several queries.
+ * Note: certain criteria must be met to perform at the DB level.
+ * For details, see https://www.prisma.io/docs/reference/api-reference/prisma-client-reference#database-upsert-query-criteria
+ */
 export function upsertTagOnName(tag: string, p: PrismaTxClient = prisma) {
     const slug = slugify(tag);
     return p.tag.upsert({