diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index df9c3c4abdd..26877de43c4 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -884,7 +884,7 @@ namespace ts {
         function tryExtendsName(extendedConfig: string): [string[], string[], string[], CompilerOptions] {
             // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
             if (!(isRootedDiskPath(extendedConfig) || startsWith(normalizeSlashes(extendedConfig), "./") || startsWith(normalizeSlashes(extendedConfig), "../"))) {
-                errors.push(createCompilerDiagnostic(Diagnostics.The_path_in_an_extends_options_must_be_relative_or_rooted));
+                errors.push(createCompilerDiagnostic(Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
                 return;
             }
             let extendedConfigPath = toPath(extendedConfig, basePath, getCanonicalFileName);
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index a163a3bb641..68fe659e81f 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -3142,7 +3142,7 @@
         "category": "Error",
         "code": 18000
     },
-    "The path in an 'extends' options must be relative or rooted.": {
+    "A path in an 'extends' option must be relative or rooted, but '{0}' is not.": {
         "category": "Error",
         "code": 18001
     },
diff --git a/src/harness/unittests/configurationExtension.ts b/src/harness/unittests/configurationExtension.ts
index 4537dc77576..8e845925eb2 100644
--- a/src/harness/unittests/configurationExtension.ts
+++ b/src/harness/unittests/configurationExtension.ts
@@ -179,7 +179,7 @@ namespace ts {
                 testFailure("can error when 'extends' is neither relative nor rooted.", "extends2.json", [{
                     code: 18001,
                     category: DiagnosticCategory.Error,
-                    messageText: `The path in an 'extends' options must be relative or rooted.`
+                    messageText: `A path in an 'extends' option must be relative or rooted, but 'configs/base' is not.`
                 }]);
             });
         });