diff --git a/Documentation/NuttxUserGuide.html b/Documentation/NuttxUserGuide.html
index 210c2e157a..eee7fce290 100644
--- a/Documentation/NuttxUserGuide.html
+++ b/Documentation/NuttxUserGuide.html
@@ -8236,12 +8236,11 @@ int    asprintf (FAR char **ptr, FAR const char *fmt, ...);
 int    snprintf(FAR char *buf, size_t size, const char *format, ...);
 int    sscanf(const char *buf, const char *fmt, ...);
 void   perror(FAR const char *s);
-int    avsprintf(FAR char **ptr, const char *fmt, va_list ap);
 
 int    vprintf(const char *s, va_list ap);
 int    vfprintf(FILE *stream, const char *s, va_list ap);
 int    vsprintf(char *buf, const char *s, va_list ap);
-int    avsprintf(FAR char **ptr, const char *fmt, va_list ap);
+int    vasprintf(FAR char **ptr, const char *fmt, va_list ap);
 int    vsnprintf(FAR char *buf, size_t size, const char *format, va_list ap);
 int    vsscanf(char *buf, const char *s, va_list ap);