diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index c53e2fcc2ec..518d7a2a1f3 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -664,6 +664,22 @@ namespace ts {
         const compilerOptions: CompilerOptions = convertCompilerOptionsFromJsonWorker(json["compilerOptions"], basePath, errors, configFileName);
         const options = extend(existingOptions, compilerOptions);
         const typingOptions: TypingOptions = convertTypingOptionsFromJsonWorker(json["typingOptions"], basePath, errors, configFileName);
+
+        // Contains the properties on the json we don't recognize, but the
+        // host might so we return them as a property bag. This allows the host to handle
+        // them, but doesn't have to deal with removing comments from the source json.
+        const other: any = {};
+
+        const knownProperties = ["compilerOptions", "typingOptions", "files", "exclude"];
+
+        for (const prop in json) {
+            if (knownProperties.indexOf(prop) >= 0) {
+                continue;
+            }
+
+            other[prop] = json[prop];
+        }
+
         options.configFilePath = configFileName;
 
         const fileNames = getFileNames(errors);
@@ -672,6 +688,7 @@ namespace ts {
             options,
             fileNames,
             typingOptions,
+            other,
             errors
         };
 
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index d0d411a710e..aede79fe237 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2592,6 +2592,7 @@ namespace ts {
         options: CompilerOptions;
         typingOptions?: TypingOptions;
         fileNames: string[];
+        other?: any;
         errors: Diagnostic[];
     }
 
diff --git a/src/services/shims.ts b/src/services/shims.ts
index b849407ebab..21f2454d7c3 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -997,6 +997,7 @@ namespace ts {
                             options: {},
                             typingOptions: {},
                             files: [],
+                            other: {},
                             errors: [realizeDiagnostic(result.error, "\r\n")]
                         };
                     }
@@ -1008,6 +1009,7 @@ namespace ts {
                         options: configFile.options,
                         typingOptions: configFile.typingOptions,
                         files: configFile.fileNames,
+                        other: configFile.other,
                         errors: realizeDiagnostics(configFile.errors, "\r\n")
                     };
                 });