diff --git a/FirebaseFunctions/Backend/index.js b/FirebaseFunctions/Backend/index.js
index 00d5d725bce..0098bf4e864 100644
--- a/FirebaseFunctions/Backend/index.js
+++ b/FirebaseFunctions/Backend/index.js
@@ -78,7 +78,7 @@ exports.unknownErrorTest = functions.https.onRequest((request, response) => {
   response.status(400).send({
     error: {
       status: 'THIS_IS_NOT_VALID',
-      message: 'this should be ignored',
+      message: 'invalid response',
     },
   });
 });
diff --git a/FirebaseFunctions/CHANGELOG.md b/FirebaseFunctions/CHANGELOG.md
index c156c6daffd..2ae2e887ade 100644
--- a/FirebaseFunctions/CHANGELOG.md
+++ b/FirebaseFunctions/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 10.11.0
+- [fixed] Provide more detail for internal errors. (#11310)
+
 # 10.10.0
 - [fixed] Fixed potential memory leak of Functions instances. (#11248)
 - [added] Callable functions can now opt in to using limited-use App Check
diff --git a/FirebaseFunctions/Sources/FunctionsError.swift b/FirebaseFunctions/Sources/FunctionsError.swift
index 6a2c52e1f74..cd205351e19 100644
--- a/FirebaseFunctions/Sources/FunctionsError.swift
+++ b/FirebaseFunctions/Sources/FunctionsError.swift
@@ -225,18 +225,18 @@ internal func FunctionsErrorForResponse(status: NSInteger,
     if let status = errorDetails["status"] as? String {
       code = FunctionsErrorCode.errorCode(forName: status)
 
+      if let message = errorDetails["message"] as? String {
+        description = message
+      } else {
+        description = code.descriptionForErrorCode
+      }
+
       // If the code in the body is invalid, treat the whole response as malformed.
       guard code != .internal else {
-        return code.generatedError(userInfo: nil)
+        return code.generatedError(userInfo: [NSLocalizedDescriptionKey: description])
       }
     }
 
-    if let message = errorDetails["message"] as? String {
-      description = message
-    } else {
-      description = code.descriptionForErrorCode
-    }
-
     details = errorDetails["details"] as AnyObject?
     if let innerDetails = details {
       // Just ignore the details if there an error decoding them.
diff --git a/FirebaseFunctions/Tests/Integration/IntegrationTests.swift b/FirebaseFunctions/Tests/Integration/IntegrationTests.swift
index 089eafd926d..da2d420f195 100644
--- a/FirebaseFunctions/Tests/Integration/IntegrationTests.swift
+++ b/FirebaseFunctions/Tests/Integration/IntegrationTests.swift
@@ -498,7 +498,7 @@ class IntegrationTests: XCTestCase {
         } catch {
           let error = error as NSError
           XCTAssertEqual(FunctionsErrorCode.internal.rawValue, error.code)
-          XCTAssertEqual("INTERNAL", error.localizedDescription)
+          XCTAssertEqual("invalid response", error.localizedDescription)
           expectation.fulfill()
           return
         }
@@ -528,7 +528,7 @@ class IntegrationTests: XCTestCase {
         } catch {
           let error = error as NSError
           XCTAssertEqual(FunctionsErrorCode.internal.rawValue, error.code)
-          XCTAssertEqual("INTERNAL", error.localizedDescription)
+          XCTAssertEqual("invalid response", error.localizedDescription)
         }
       }
     }
diff --git a/FirebaseFunctions/Tests/ObjCIntegration/FIRIntegrationTests.m b/FirebaseFunctions/Tests/ObjCIntegration/FIRIntegrationTests.m
index 124f2eb9044..a6fff65c04e 100644
--- a/FirebaseFunctions/Tests/ObjCIntegration/FIRIntegrationTests.m
+++ b/FirebaseFunctions/Tests/ObjCIntegration/FIRIntegrationTests.m
@@ -226,7 +226,7 @@ - (void)testUnknownError {
                 completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
                   XCTAssertNotNil(error);
                   XCTAssertEqual(FIRFunctionsErrorCodeInternal, error.code);
-                  XCTAssertEqualObjects(@"INTERNAL", error.localizedDescription);
+                  XCTAssertEqualObjects(@"invalid response", error.localizedDescription);
                   [expectation fulfill];
                 }];
   [self waitForExpectations:@[ expectation ] timeout:10];