diff --git a/cmd/soundtouch-player/README.md b/cmd/soundtouch-player/README.md
index fa4150c7..75120f9f 100644
--- a/cmd/soundtouch-player/README.md
+++ b/cmd/soundtouch-player/README.md
@@ -348,6 +348,14 @@ Based on WebSocket interaction analysis, potential future features:
 - Advanced preset programming
 - Progressive Web App (PWA) features
 
+## Behaviour reference
+
+[Player: Sources and Selection State](../../docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md)
+covers the parts that are not obvious from the code: which advertised sources
+can actually be selected and which need a station ContentItem, how a selection
+is confirmed against a speaker that answers 200 either way, and the revision
+and epoch fields the browser uses to order status updates.
+
 ## License
 
 Same as the parent project - see main repository LICENSE file.
diff --git a/docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md b/docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md
index 2052cf40..07f774cf 100644
--- a/docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md
+++ b/docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md
@@ -54,13 +54,13 @@ after the fact. The only remedy is not to issue such a select.
 
 ## What the player does instead
 
-| Source | Click behaviour | Resumes from Recents |
-| --- | --- | --- |
-| `RADIO_BROWSER` | resume newest station, else open RadioBrowser | yes |
-| `TUNEIN` | resume newest station, else open TuneIn | yes |
-| `LOCAL_INTERNET_RADIO` | open Play URL | no |
-| `STORED_MUSIC` | open Library | no |
-| anything else | `POST /select` as before | n/a |
+| Source                 | Click behaviour                               | Resumes from Recents |
+|------------------------|-----------------------------------------------|----------------------|
+| `RADIO_BROWSER`        | resume newest station, else open RadioBrowser | yes                  |
+| `TUNEIN`               | resume newest station, else open TuneIn       | yes                  |
+| `LOCAL_INTERNET_RADIO` | open Play URL                                 | no                   |
+| `STORED_MUSIC`         | open Library                                  | no                   |
+| anything else          | `POST /select` as before                      | n/a                  |
 
 Resuming replays the newest Recents entry for that source, using that entry's
 own ContentItem: the real item the speaker was given, `Location` included.
diff --git a/docs/content/docs/reference/SOURCE-SELECTION.md b/docs/content/docs/reference/SOURCE-SELECTION.md
index 09b833f7..8a8913b0 100644
--- a/docs/content/docs/reference/SOURCE-SELECTION.md
+++ b/docs/content/docs/reference/SOURCE-SELECTION.md
@@ -29,17 +29,34 @@ The Bose SoundTouch Go client provides comprehensive source selection functional
 
 **Response**: HTTP 200 OK (no body) on success
 
-**Supported Sources:**
-- `SPOTIFY` - Spotify streaming service
+**Sources selectable this way:**
+- `SPOTIFY` - Spotify streaming service (with a real `sourceAccount`)
 - `BLUETOOTH` - Bluetooth audio input
 - `AUX` - Auxiliary input (3.5mm jack)
-- `TUNEIN` - TuneIn internet radio
-- `PANDORA` - Pandora streaming service
-- `AMAZON` - Amazon Music
-- `IHEARTRADIO` - iHeartRadio streaming
-- `STORED_MUSIC` - Local/network stored music
 - `AIRPLAY` - Apple AirPlay (device dependent)
+- `PANDORA`, `AMAZON`, `IHEARTRADIO` - streaming services (with an account)
+
+### Sources that need a ContentItem instead
+
+A bare `/select` carrying only a source and account is **not** enough for
+every source a speaker advertises. These need a full ContentItem with a
+`Location`, built by `stations.ResolveContentItem` with `type="stationurl"`:
+
+- `TUNEIN` - TuneIn internet radio
 - `RADIO_BROWSER` - [RadioBrowser](radio-browser.md) internet radio directory
+- `LOCAL_INTERNET_RADIO` - stream URLs, including Play URL and TTS output
+- `STORED_MUSIC` - one entry per media server; selecting it names no track
+
+Given a bare select for one of these the speaker does **not** report an
+error. It answers `200`, parks on a stub now-playing with no `playStatus`,
+empty `type` and `location`, and an `itemName` echoing the source name, and
+carries on playing whatever it was playing. It then reports that stub
+indefinitely, so callers that check `/now_playing` see the source they asked
+for while the audio is something else.
+
+Use `SelectContentItem` with a real `Location` for these, and see
+[Player: Sources and Selection State](PLAYER-SOURCE-BEHAVIOUR.md) for the
+stub's full signature and how the web player avoids it.
 
 ## Client Library Usage
 
@@ -158,20 +175,20 @@ soundtouch-cli -host 192.0.2.100 -aux
 
 ### CLI Flags
 
-| Flag | Description | Example |
-|------|-------------|---------|
-| `-select-source <source>` | Select audio source | `-select-source SPOTIFY` |
-| `-source-account <account>` | Account for streaming services | `-source-account "user123"` |
-| `-spotify` | Select Spotify source | `-spotify -source-account "user"` |
-| `-bluetooth` | Select Bluetooth source | `-bluetooth` |
-| `-aux` | Select AUX input | `-aux` |
+| Flag                        | Description                    | Example                           |
+|-----------------------------|--------------------------------|-----------------------------------|
+| `-select-source <source>`   | Select audio source            | `-select-source SPOTIFY`          |
+| `-source-account <account>` | Account for streaming services | `-source-account "user123"`       |
+| `-spotify`                  | Select Spotify source          | `-spotify -source-account "user"` |
+| `-bluetooth`                | Select Bluetooth source        | `-bluetooth`                      |
+| `-aux`                      | Select AUX input               | `-aux`                            |
 
 ## Source Account Information
 
 ### When Source Accounts are Required
 
 - **Spotify**: Required for multi-account setups
-- **Pandora**: Required for account-based access  
+- **Pandora**: Required for account-based access
 - **TuneIn**: Optional, may improve personalization
 - **Amazon Music**: Required for account access
 - **Bluetooth/AUX**: Not required (leave empty)
@@ -259,11 +276,11 @@ func selectWithConfig(client *client.Client, config SourceConfig) error {
 
 ### Common Error Codes
 
-| Code | Name | Description | Solution |
-|------|------|-------------|----------|
-| 1005 | UNKNOWN_SOURCE_ERROR | Invalid or unavailable source | Check available sources first |
-| 1006 | SOURCE_UNAVAILABLE | Source temporarily unavailable | Try again later |
-| 1007 | ACCOUNT_ERROR | Invalid account for source | Check account name format |
+| Code | Name                 | Description                    | Solution                      |
+|------|----------------------|--------------------------------|-------------------------------|
+| 1005 | UNKNOWN_SOURCE_ERROR | Invalid or unavailable source  | Check available sources first |
+| 1006 | SOURCE_UNAVAILABLE   | Source temporarily unavailable | Try again later               |
+| 1007 | ACCOUNT_ERROR        | Invalid account for source     | Check account name format     |
 
 ### Troubleshooting Tips
 
@@ -347,13 +364,16 @@ The implementation follows the official SoundTouch API:
 
 ## Related Documentation
 
+- [Player: Sources and Selection State](PLAYER-SOURCE-BEHAVIOUR.md) - which
+  sources accept a bare select, and how a selection is confirmed
+
 - **[API Endpoints Overview](API-ENDPOINTS.md)** - Complete API reference
-- **[Sources](https://github.com/gesellix/Bose-SoundTouch/blob/main/pkg/models/sources.go)** - Source model implementation  
+- **[Sources](https://github.com/gesellix/Bose-SoundTouch/blob/main/pkg/models/sources.go)** - Source model implementation
 - **[Now Playing](https://github.com/gesellix/Bose-SoundTouch/blob/main/pkg/models/nowplaying.go)** - ContentItem model
 - **[Client Usage Examples](https://github.com/gesellix/Bose-SoundTouch/blob/main/cmd/soundtouch-cli/main.go)** - CLI implementation reference
 
 ---
 
-**Implementation Date**: 2026-01-09  
-**Status**: ✅ Complete and tested  
+**Implementation Date**: 2026-01-09
+**Status**: ✅ Complete and tested
 **Real Device Validation**: SoundTouch 10, SoundTouch 20
diff --git a/pkg/client/client.go b/pkg/client/client.go
index dfa860c6..9799ad95 100644
--- a/pkg/client/client.go
+++ b/pkg/client/client.go
@@ -796,7 +796,14 @@ func (c *Client) DecreaseBalance(amount int) (*models.Balance, error) {
 	return c.GetBalance()
 }
 
-// SelectSource selects an audio source using the /select endpoint
+// SelectSource selects an audio source using the /select endpoint.
+//
+// Only sources that are inputs in their own right can be selected this way:
+// AUX, BLUETOOTH, or a streaming service with a real sourceAccount. Provider
+// sources (TUNEIN, RADIO_BROWSER, LOCAL_INTERNET_RADIO) and STORED_MUSIC need
+// SelectContentItem with a Location instead; a bare select leaves such a
+// speaker reporting a source it is not playing. See
+// docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md.
 func (c *Client) SelectSource(source, sourceAccount string) error {
 	// Validate source parameter
 	if source == "" {
@@ -861,7 +868,15 @@ func (c *Client) SelectAux() error {
 	return c.SelectSource("AUX", "")
 }
 
-// SelectTuneIn is a convenience method to select TuneIn source
+// SelectTuneIn is a convenience method to select TuneIn source.
+//
+// This sends a bare select, with no station. A speaker does not report an
+// error for that: it answers 200, parks on a stub now-playing (no playStatus,
+// empty type and location, itemName echoing the source name) and carries on
+// playing whatever it was playing, then reports that stub indefinitely. To
+// actually play something use SelectContentItem with a ContentItem carrying a
+// Location, as stations.ResolveContentItem builds. See
+// docs/content/docs/reference/PLAYER-SOURCE-BEHAVIOUR.md.
 func (c *Client) SelectTuneIn(sourceAccount string) error {
 	return c.SelectSource("TUNEIN", sourceAccount)
 }