diff --git a/docs/DEBUG b/docs/DEBUG
index 4a5ac3a40..7398df69b 100644
--- a/docs/DEBUG
+++ b/docs/DEBUG
@@ -270,12 +270,12 @@ to access them.
     `FT2_DEBUG' environment  variable.  Use this function  to override
     the value with `level'.  Use value `NULL' to disable tracing.
 
-  FT_Trace_Set_Default_Level():
+  FT_Trace_Set_Default_Level( void )
 
     Reset the tracing levels to the default value, i.e., the value of
     the `FT2_DEBUG' environment variable or no tracing if not set.
 
-  FT_Set_Log_Handler( ft_custom_log_handler  handler ):
+  FT_Set_Log_Handler( ft_custom_log_handler  handler )
 
     Use `handler' as a custom handler for formatting tracing and error
     messages.  The  `ft_custom_log_handler' typedef has  the following
@@ -290,7 +290,7 @@ to access them.
    first argument  of `FT_TRACE' or  `FT_ERROR', and `args'  holds the
    remaining arguments.
 
-  FT_Set_Default_Log_Handler():
+  FT_Set_Default_Log_Handler( void )
 
     Reset the log handler to the default version.