Index: src/OFString.h
==================================================================
--- src/OFString.h
+++ src/OFString.h
@@ -517,17 +517,25 @@
 - initWithContentsOfURL: (OFURL*)URL
 	       encoding: (of_string_encoding_t)encoding;
 
 /**
  * \brief Returns the OFString as a UTF-8 encoded C string.
+ *
+ * The result is valid until the autorelease pool is released. If you want to
+ * use the result outside the scope of the current autorelease pool, you have to
+ * copy it.
  *
  * \return The OFString as a UTF-8 encoded C string
  */
 - (const char*)UTF8String;
 
 /**
  * \brief Returns the OFString as a C string in the specified encoding.
+ *
+ * The result is valid until the autorelease pool is released. If you want to
+ * use the result outside the scope of the current autorelease pool, you have to
+ * copy it.
  *
  * \param encoding The encoding for the C string
  * \return The OFString as a C string in the specified encoding
  */
 - (const char*)cStringWithEncoding: (of_string_encoding_t)encoding;;