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diff --git a/ext/mbed_error.h b/ext/mbed_error.h
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+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_ERROR_H
+#define MBED_ERROR_H
+
+/** To generate a fatal compile-time error, you can use the pre-processor #error directive.
+ *
+ * @code
+ * #error "That shouldn't have happened!"
+ * @endcode
+ *
+ * If the compiler evaluates this line, it will report the error and stop the compile.
+ *
+ * For example, you could use this to check some user-defined compile-time variables:
+ *
+ * @code
+ * #define NUM_PORTS 7
+ * #if (NUM_PORTS > 4)
+ *     #error "NUM_PORTS must be less than 4"
+ * #endif
+ * @endcode
+ *
+ * Reporting Run-Time Errors:
+ * To generate a fatal run-time error, you can use the mbed error() function.
+ *
+ * @code
+ * error("That shouldn't have happened!");
+ * @endcode
+ *
+ * If the mbed running the program executes this function, it will print the
+ * message via the USB serial port, and then die with the blue lights of death!
+ *
+ * The message can use printf-style formatting, so you can report variables in the
+ * message too. For example, you could use this to check a run-time condition:
+ *
+ * @code
+ * if(x >= 5) {
+ *     error("expected x to be less than 5, but got %d", x);
+ * }
+ * #endcode
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void error(const char* format, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif