diff --git a/ipa/general/0106.md b/ipa/general/0106.md
index 10df81b..de90a5c 100644
--- a/ipa/general/0106.md
+++ b/ipa/general/0106.md
@@ -19,6 +19,9 @@ Adopt
 
 - APIs **should** provide a create method for resources unless it is not
   valuable for users to do so
+  - [Read-only resources](0101.md#read-only-resources) **must not** have a
+    Create method
+  - [Singleton resources](0113.md) **must not** have a Create method
   - The purpose of the create method is to create a new resource in a collection
 - The HTTP verb **must** be
   [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST)
diff --git a/ipa/general/0107.md b/ipa/general/0107.md
index a1529c2..7083311 100644
--- a/ipa/general/0107.md
+++ b/ipa/general/0107.md
@@ -19,6 +19,10 @@ Adopt
 
 - APIs **should** provide an update method for resources unless it is not
   valuable for users to do so
+  - [Read-only resources](0101.md#read-only-resources) **must not** have an
+    Update method
+  - [Read-only singleton resources](0113.md#read-only-singleton-resources)
+    **must not** have an Update method
   - The purpose of the Update method is to make changes to the resources without
     causing side effects
 - The HTTP verb **should** be
diff --git a/ipa/general/0108.md b/ipa/general/0108.md
index a438374..617a4ef 100644
--- a/ipa/general/0108.md
+++ b/ipa/general/0108.md
@@ -19,6 +19,9 @@ Adopt
 
 - APIs **should** provide a Delete method for resources unless it is not
   valuable for users to do so
+  - [Read-only resources](0101.md#read-only-resources) **must not** have a
+    Delete method
+  - [Singleton resources](0113.md) **must not** have a Delete method
 - The HTTP verb **must** be
   [`DELETE`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/DELETE)
 - The response **should** be empty