diff --git a/Blog-Client.md b/Blog-Client.md
index cd7bc25..def7580 100644
--- a/Blog-Client.md
+++ b/Blog-Client.md
@@ -10,7 +10,7 @@ The client's identifier is `org.briarproject.briar.blog`. The major version is 0
 
 ### Groups
 
-Each blog is represented by a separate BSP group. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) with two elements: `author` (list) and `rss` (boolean).
+Each blog is represented by a separate BSP group. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) with two elements: `author` (list) and `rss` (boolean).
 
 `author` is a list with three elements: `formatVersion` (int), `nickname` (string) and `publicKey` (raw). This identifies the user who publishes the blog.
 
diff --git a/Blog-Sharing-Client.md b/Blog-Sharing-Client.md
index b764318..79fb1c9 100644
--- a/Blog-Sharing-Client.md
+++ b/Blog-Sharing-Client.md
@@ -6,7 +6,7 @@ The client's identifier is `org.briarproject.briar.blog.sharing`. The major vers
 
 ### Groups
 
-The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+The client uses a separate BSP group for communicating with each contact. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
 
 ### Roles
 
diff --git a/Forum-Client.md b/Forum-Client.md
index bb277f8..5bbc95e 100644
--- a/Forum-Client.md
+++ b/Forum-Client.md
@@ -8,7 +8,7 @@ The client's identifier is `org.briarproject.briar.forum`. The major version is
 
 ### Groups
 
-Each forum is represented by a separate BSP group. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) with two elements: `name` (string) and `salt` (raw). The salt is 32 random bytes, to prevent collisions between forums with the same name.
+Each forum is represented by a separate BSP group. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) with two elements: `name` (string) and `salt` (raw). The salt is 32 random bytes, to prevent collisions between forums with the same name.
 
 ### Message types
 
diff --git a/Forum-Sharing-Client.md b/Forum-Sharing-Client.md
index e2397ef..d6a0ee9 100644
--- a/Forum-Sharing-Client.md
+++ b/Forum-Sharing-Client.md
@@ -6,7 +6,7 @@ The client's identifier is `org.briarproject.briar.forum.sharing`. The major ver
 
 ### Groups
 
-The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+The client uses a separate BSP group for communicating with each contact. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
 
 ### Roles
 
diff --git a/Introduction-Client.md b/Introduction-Client.md
index 9e2727c..5f90b36 100644
--- a/Introduction-Client.md
+++ b/Introduction-Client.md
@@ -6,7 +6,7 @@ The client's identifier is `org.briarproject.briar.introduction`. The major vers
 
 ### Groups
 
-The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+The client uses a separate BSP group for communicating with each contact. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
 
 ### Roles
 
diff --git a/Messaging-Client.md b/Messaging-Client.md
index e75180a..3f2f55f 100644
--- a/Messaging-Client.md
+++ b/Messaging-Client.md
@@ -6,7 +6,7 @@ The client's identifier is `org.briarproject.briar.messaging`. The major version
 
 ### Groups
 
-The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+The client uses a separate BSP group for communicating with each contact. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
 
 ### Message types
 
diff --git a/Private-Group-Client.md b/Private-Group-Client.md
index 66c18ed..09c2d22 100644
--- a/Private-Group-Client.md
+++ b/Private-Group-Client.md
@@ -8,7 +8,7 @@ The client's identifier is `org.briarproject.briar.privategroup`. The major vers
 
 ### Groups
 
-Each private group is represented by a separate BSP group. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) with three elements: `creator` (list), `name` (string), and `salt` (raw).
+Each private group is represented by a separate BSP group. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) with three elements: `creator` (list), `name` (string), and `salt` (raw).
 
 `creator` is a list with three elements: `formatVersion` (int), `nickname` (string), and `publicKey` (raw). This identifies the user who created the private group. The salt is 32 random bytes, to prevent collisions between private groups with the same creator and name.
 
diff --git a/Private-Group-Sharing-Client.md b/Private-Group-Sharing-Client.md
index 377996d..99b2130 100644
--- a/Private-Group-Sharing-Client.md
+++ b/Private-Group-Sharing-Client.md
@@ -6,7 +6,7 @@ The client's identifier is `org.briarproject.briar.privategroup.invitation`. The
 
 ### Groups
 
-The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+The client uses a separate BSP group for communicating with each contact. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
 
 ### Roles
 
diff --git a/Transport-Properties-Client.md b/Transport-Properties-Client.md
index 6e118b1..6a0305c 100644
--- a/Transport-Properties-Client.md
+++ b/Transport-Properties-Client.md
@@ -6,7 +6,7 @@ The client's identifier is `org.briarproject.bramble.transport`. The major versi
 
 ### Groups
 
-The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+The client uses a separate BSP group for communicating with each contact. The [group descriptor](https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BSP.md#23-groups) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
 
 The client also uses a group with an empty descriptor for storing local transport properties. This group is not shared with any contacts.