diff --git a/README.md b/README.md
index 1ee30dbc..211cabf9 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ Ruma 0.6 supports all events and REST endpoints of Matrix v1.0, v1.1 and v1.2.
 Various changes from in-progress or finished MSCs are also implemented, gated
 behind the `unstable-mscXXXX` (where `XXXX` is the MSC number) Cargo features.
 
-A few less formalized things are gated behind the `unstable-pre-spec` Cargo
+A few less formalized things are gated behind the `unstable-unspecified` Cargo
 feature.
 
 ## Contributing
diff --git a/crates/ruma-common/Cargo.toml b/crates/ruma-common/Cargo.toml
index 39fd23cb..f112f634 100644
--- a/crates/ruma-common/Cargo.toml
+++ b/crates/ruma-common/Cargo.toml
@@ -31,9 +31,6 @@ markdown = ["pulldown-cmark"]
 # https://github.com/dtolnay/trybuild/issues/171
 rand = ["dep:rand_crate", "dep:uuid"]
 unstable-exhaustive-types = []
-unstable-pdu = []
-unstable-pre-spec = []
-unstable-sanitize = ["dep:html5ever", "dep:phf"]
 unstable-msc1767 = []
 unstable-msc2285 = []
 unstable-msc2448 = []
@@ -52,6 +49,9 @@ unstable-msc3553 = ["unstable-msc3552"]
 unstable-msc3554 = ["unstable-msc1767"]
 unstable-msc3786 = []
 unstable-msc3827 = []
+unstable-pdu = []
+unstable-sanitize = ["dep:html5ever", "dep:phf"]
+unstable-unspecified = []
 
 [dependencies]
 base64 = "0.13.0"
diff --git a/crates/ruma-common/src/push.rs b/crates/ruma-common/src/push.rs
index 4076fb5e..516b56c5 100644
--- a/crates/ruma-common/src/push.rs
+++ b/crates/ruma-common/src/push.rs
@@ -18,7 +18,7 @@ use std::hash::{Hash, Hasher};
 
 use indexmap::{Equivalent, IndexSet};
 use serde::{Deserialize, Serialize};
-#[cfg(feature = "unstable-pre-spec")]
+#[cfg(feature = "unstable-unspecified")]
 use serde_json::Value as JsonValue;
 use tracing::instrument;
 
@@ -422,7 +422,7 @@ pub struct PusherData {
     ///
     /// [sygnal]: https://github.com/matrix-org/sygnal/blob/main/docs/applications.md#ios-applications-beware
     // Not specified, issue: https://github.com/matrix-org/matrix-spec/issues/921
-    #[cfg(feature = "unstable-pre-spec")]
+    #[cfg(feature = "unstable-unspecified")]
     #[serde(default, skip_serializing_if = "JsonValue::is_null")]
     pub default_payload: JsonValue,
 }
@@ -435,12 +435,12 @@ impl PusherData {
 
     /// Returns `true` if all fields are `None`.
     pub fn is_empty(&self) -> bool {
-        #[cfg(not(feature = "unstable-pre-spec"))]
+        #[cfg(not(feature = "unstable-unspecified"))]
         {
             self.url.is_none() && self.format.is_none()
         }
 
-        #[cfg(feature = "unstable-pre-spec")]
+        #[cfg(feature = "unstable-unspecified")]
         {
             self.url.is_none() && self.format.is_none() && self.default_payload.is_null()
         }
diff --git a/crates/ruma-common/src/thirdparty.rs b/crates/ruma-common/src/thirdparty.rs
index 609d3c13..fa0d7cf7 100644
--- a/crates/ruma-common/src/thirdparty.rs
+++ b/crates/ruma-common/src/thirdparty.rs
@@ -90,7 +90,7 @@ pub struct ProtocolInstance {
     /// A unique identifier across all instances.
     ///
     /// See [matrix-spec#833](https://github.com/matrix-org/matrix-spec/issues/833).
-    #[cfg(feature = "unstable-pre-spec")]
+    #[cfg(feature = "unstable-unspecified")]
     pub instance_id: String,
 }
 
@@ -113,7 +113,7 @@ pub struct ProtocolInstanceInit {
     /// A unique identifier across all instances.
     ///
     /// See [matrix-spec#833](https://github.com/matrix-org/matrix-spec/issues/833).
-    #[cfg(feature = "unstable-pre-spec")]
+    #[cfg(feature = "unstable-unspecified")]
     pub instance_id: String,
 }
 
@@ -123,7 +123,7 @@ impl From<ProtocolInstanceInit> for ProtocolInstance {
             desc,
             fields,
             network_id,
-            #[cfg(feature = "unstable-pre-spec")]
+            #[cfg(feature = "unstable-unspecified")]
             instance_id,
         } = init;
         Self {
@@ -131,7 +131,7 @@ impl From<ProtocolInstanceInit> for ProtocolInstance {
             icon: None,
             fields,
             network_id,
-            #[cfg(feature = "unstable-pre-spec")]
+            #[cfg(feature = "unstable-unspecified")]
             instance_id,
         }
     }
diff --git a/crates/ruma-federation-api/Cargo.toml b/crates/ruma-federation-api/Cargo.toml
index 196ed3cc..358c9df9 100644
--- a/crates/ruma-federation-api/Cargo.toml
+++ b/crates/ruma-federation-api/Cargo.toml
@@ -20,10 +20,10 @@ compat = []
 client = []
 server = []
 unstable-exhaustive-types = []
-unstable-pre-spec = []
 unstable-msc2448 = []
 unstable-msc3618 = []
 unstable-msc3723 = []
+unstable-unspecified = []
 
 [dependencies]
 js_int = { version = "0.2.0", features = ["serde"] }
diff --git a/crates/ruma-federation-api/src/membership/create_join_event.rs b/crates/ruma-federation-api/src/membership/create_join_event.rs
index 3402847c..814aae75 100644
--- a/crates/ruma-federation-api/src/membership/create_join_event.rs
+++ b/crates/ruma-federation-api/src/membership/create_join_event.rs
@@ -12,7 +12,7 @@ use serde_json::value::RawValue as RawJsonValue;
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct RoomState {
-    #[cfg(not(feature = "unstable-pre-spec"))]
+    #[cfg(not(feature = "unstable-unspecified"))]
     /// The resident server's DNS name.
     pub origin: String,
 
@@ -24,7 +24,7 @@ pub struct RoomState {
     pub state: Vec<Box<RawJsonValue>>,
 }
 
-#[cfg(feature = "unstable-pre-spec")]
+#[cfg(feature = "unstable-unspecified")]
 impl Default for RoomState {
     fn default() -> Self {
         Self::new()
@@ -32,19 +32,19 @@ impl Default for RoomState {
 }
 
 impl RoomState {
-    #[cfg(not(feature = "unstable-pre-spec"))]
+    #[cfg(not(feature = "unstable-unspecified"))]
     /// Creates an empty `RoomState` with the given `origin`.
     ///
-    /// With the `unstable-pre-spec` feature, this method doesn't take any parameters.
+    /// With the `unstable-unspecified` feature, this method doesn't take any parameters.
     /// See [matrix-spec#374](https://github.com/matrix-org/matrix-spec/issues/374).
     pub fn new(origin: String) -> Self {
         Self { origin, auth_chain: Vec::new(), state: Vec::new() }
     }
 
-    #[cfg(feature = "unstable-pre-spec")]
+    #[cfg(feature = "unstable-unspecified")]
     /// Creates an empty `RoomState` with the given `origin`.
     ///
-    /// Without the `unstable-pre-spec` feature, this method takes a parameter for the origin
+    /// Without the `unstable-unspecified` feature, this method takes a parameter for the origin
     /// See [matrix-spec#374](https://github.com/matrix-org/matrix-spec/issues/374).
     pub fn new() -> Self {
         Self { auth_chain: Vec::new(), state: Vec::new() }
diff --git a/crates/ruma-federation-api/src/membership/create_join_event/v1.rs b/crates/ruma-federation-api/src/membership/create_join_event/v1.rs
index d1f07007..37333cb3 100644
--- a/crates/ruma-federation-api/src/membership/create_join_event/v1.rs
+++ b/crates/ruma-federation-api/src/membership/create_join_event/v1.rs
@@ -56,7 +56,7 @@ impl Response {
     }
 }
 
-#[cfg(all(test, feature = "server", not(feature = "unstable-pre-spec")))]
+#[cfg(all(test, feature = "server", not(feature = "unstable-unspecified")))]
 mod tests {
     use ruma_common::api::OutgoingResponse;
     use serde_json::{from_slice as from_json_slice, json, Value as JsonValue};
diff --git a/crates/ruma-federation-api/src/serde/v1_pdu.rs b/crates/ruma-federation-api/src/serde/v1_pdu.rs
index 9f79a3c8..2591a762 100644
--- a/crates/ruma-federation-api/src/serde/v1_pdu.rs
+++ b/crates/ruma-federation-api/src/serde/v1_pdu.rs
@@ -67,7 +67,7 @@ where
     }
 }
 
-#[cfg(not(feature = "unstable-pre-spec"))]
+#[cfg(not(feature = "unstable-unspecified"))]
 #[cfg(test)]
 mod tests {
     use assert_matches::assert_matches;
diff --git a/crates/ruma-federation-api/src/transactions/send_transaction_message.rs b/crates/ruma-federation-api/src/transactions/send_transaction_message.rs
index 46e617be..93c3e79e 100644
--- a/crates/ruma-federation-api/src/transactions/send_transaction_message.rs
+++ b/crates/ruma-federation-api/src/transactions/send_transaction_message.rs
@@ -44,9 +44,9 @@ pub mod v1 {
             ///
             /// Must not be more than 50 items.
             ///
-            /// With the `unstable-pre-spec` feature, sending `pdus` is optional.
+            /// With the `unstable-unspecified` feature, sending `pdus` is optional.
             /// See [matrix-spec#705](https://github.com/matrix-org/matrix-spec/issues/705).
-            #[cfg_attr(feature = "unstable-pre-spec", serde(default, skip_serializing_if = "<[_]>::is_empty"))]
+            #[cfg_attr(feature = "unstable-unspecified", serde(default, skip_serializing_if = "<[_]>::is_empty"))]
             pub pdus: &'a [Box<RawJsonValue>],
 
             /// List of ephemeral messages.
diff --git a/crates/ruma-push-gateway-api/Cargo.toml b/crates/ruma-push-gateway-api/Cargo.toml
index 40f08fe5..7324d270 100644
--- a/crates/ruma-push-gateway-api/Cargo.toml
+++ b/crates/ruma-push-gateway-api/Cargo.toml
@@ -15,7 +15,7 @@ all-features = true
 
 [features]
 unstable-exhaustive-types = []
-unstable-pre-spec = []
+unstable-unspecified = []
 client = []
 server = []
 
diff --git a/crates/ruma-push-gateway-api/src/send_event_notification.rs b/crates/ruma-push-gateway-api/src/send_event_notification.rs
index 9326679d..1a1e463b 100644
--- a/crates/ruma-push-gateway-api/src/send_event_notification.rs
+++ b/crates/ruma-push-gateway-api/src/send_event_notification.rs
@@ -18,7 +18,7 @@ pub mod v1 {
     };
     use serde::{Deserialize, Serialize};
     use serde_json::value::RawValue as RawJsonValue;
-    #[cfg(feature = "unstable-pre-spec")]
+    #[cfg(feature = "unstable-unspecified")]
     use serde_json::value::Value as JsonValue;
 
     use crate::PrivOwnedStr;
@@ -256,7 +256,7 @@ pub mod v1 {
         ///
         /// [sygnal]: https://github.com/matrix-org/sygnal/blob/main/docs/applications.md#ios-applications-beware
         // Not specified, issue: https://github.com/matrix-org/matrix-spec/issues/921
-        #[cfg(feature = "unstable-pre-spec")]
+        #[cfg(feature = "unstable-unspecified")]
         #[serde(default, skip_serializing_if = "JsonValue::is_null")]
         pub default_payload: JsonValue,
     }
@@ -269,12 +269,12 @@ pub mod v1 {
 
         /// Returns `true` if all fields are `None`.
         pub fn is_empty(&self) -> bool {
-            #[cfg(not(feature = "unstable-pre-spec"))]
+            #[cfg(not(feature = "unstable-unspecified"))]
             {
                 self.format.is_none()
             }
 
-            #[cfg(feature = "unstable-pre-spec")]
+            #[cfg(feature = "unstable-unspecified")]
             {
                 self.format.is_none() && self.default_payload.is_null()
             }
@@ -285,14 +285,14 @@ pub mod v1 {
         fn from(data: ruma_common::push::PusherData) -> Self {
             let ruma_common::push::PusherData {
                 format,
-                #[cfg(feature = "unstable-pre-spec")]
+                #[cfg(feature = "unstable-unspecified")]
                 default_payload,
                 ..
             } = data;
 
             Self {
                 format,
-                #[cfg(feature = "unstable-pre-spec")]
+                #[cfg(feature = "unstable-unspecified")]
                 default_payload,
             }
         }
diff --git a/crates/ruma/Cargo.toml b/crates/ruma/Cargo.toml
index 82d4e134..bfe4ea97 100644
--- a/crates/ruma/Cargo.toml
+++ b/crates/ruma/Cargo.toml
@@ -117,13 +117,6 @@ unstable-extensible-events = [
     "unstable-msc3488",
     "unstable-msc3553",
 ]
-unstable-pdu = ["ruma-common/unstable-pdu"]
-unstable-pre-spec = [
-    "ruma-common/unstable-pre-spec",
-    "ruma-federation-api?/unstable-pre-spec",
-    "ruma-push-gateway-api?/unstable-pre-spec",
-]
-unstable-sanitize = ["ruma-common/unstable-sanitize"]
 unstable-msc1767 = ["ruma-common/unstable-msc1767"]
 unstable-msc2246 = ["ruma-client-api?/unstable-msc2246"]
 unstable-msc2285 = [
@@ -169,11 +162,18 @@ unstable-msc3618 = ["ruma-federation-api?/unstable-msc3618"]
 unstable-msc3723 = ["ruma-federation-api?/unstable-msc3723"]
 unstable-msc3786 = ["ruma-common/unstable-msc3786"]
 unstable-msc3827 = ["ruma-common/unstable-msc3827"]
+unstable-pdu = ["ruma-common/unstable-pdu"]
+unstable-sanitize = ["ruma-common/unstable-sanitize"]
+unstable-unspecified = [
+    "ruma-common/unstable-unspecified",
+    "ruma-federation-api?/unstable-unspecified",
+    "ruma-push-gateway-api?/unstable-unspecified",
+]
 
 # Private feature, only used in test / benchmarking code
 __ci = [
     "full",
-    "unstable-pre-spec",
+    "unstable-unspecified",
     "unstable-sanitize",
     "unstable-msc1767",
     "unstable-msc2285",
diff --git a/crates/ruma/src/lib.rs b/crates/ruma/src/lib.rs
index 0be25254..5004821a 100644
--- a/crates/ruma/src/lib.rs
+++ b/crates/ruma/src/lib.rs
@@ -50,7 +50,8 @@
 //!   types as exhaustive.
 //! * `unstable-mscXXXX`, where `XXXX` is the MSC number -- Upcoming Matrix features that may be
 //!   subject to change or removal.
-//! * `unstable-pre-spec` -- Undocumented Matrix features that may be subject to change or removal.
+//! * `unstable-unspecified` -- Undocumented Matrix features that may be subject to change or
+//!   removal.
 //! * `unstable-sanitize` -- Convenience methods for spec-compliant HTML sanitization that have not
 //!   been thoroughly tested.
 //!