diff --git a/aio/content/errors/NG0203.md b/aio/content/errors/NG0203.md
index 241c3373faa..77c77c66c15 100644
--- a/aio/content/errors/NG0203.md
+++ b/aio/content/errors/NG0203.md
@@ -1,9 +1,10 @@
 @name `inject()` must be called from an injection context
 @category runtime
-@shortDescription `inject()` must be called from an injection context (a constructor, a factory function or a field initializer)
+@shortDescription `inject()` must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with `EnvironmentInjector#runInContext`.
 
 @description
-You see this error when you try to use the `inject()` function outside of the allowed injection context. The injection context is available during the class creation and initialization. 
+You see this error when you try to use the `inject()` function outside of the allowed injection context. The injection context is available during the class creation and initialization. It is also available to functions
+used with `EnvironmentInjector#runInContext`.
 
 In practice the `inject()` calls are allowed in a constructor, a constructor parameter and a field initializer:
 
@@ -34,7 +35,7 @@ providers: [
 ]
 ```
 
-Calls to the `inject()` function outside of the class creation context will result in error. Most notably, calls to `inject()` are disallowed after a class instance was created, in methods (including lifecycle hooks):
+Calls to the `inject()` function outside of the class creation or `runInContext` will result in error. Most notably, calls to `inject()` are disallowed after a class instance was created, in methods (including lifecycle hooks):
 
 ```typescript
 @Component({ ... })
diff --git a/packages/core/src/di/injector_compatibility.ts b/packages/core/src/di/injector_compatibility.ts
index 52764be3039..fee67983f05 100644
--- a/packages/core/src/di/injector_compatibility.ts
+++ b/packages/core/src/di/injector_compatibility.ts
@@ -57,7 +57,7 @@ export function injectInjectorOnly<T>(token: ProviderToken<T>, flags = InjectFla
     throw new RuntimeError(
         RuntimeErrorCode.MISSING_INJECTION_CONTEXT,
         ngDevMode &&
-            `inject() must be called from an injection context (a constructor, a factory function or a field initializer)`);
+            `inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with \`EnvironmentInjector#runInContext\`.`);
   } else if (_currentInjector === null) {
     return injectRootLimpMode(token, undefined, flags);
   } else {