5 files changed, 14 insertions, 0 deletions
diff --git a/src/error/error.c b/src/error/error.c
index 6b15c4c..496ce3c 100644
--- a/src/error/error.c
+++ b/src/error/error.c
@@ -35,6 +35,8 @@
  *                 be printed.
  * @param  format  Formatting-string for a detailed description of what happend.
  * @param  args    Formatting-arguments for `format`.
+ * 
+ * @since  Always.
  */
 void error(int status, int errnum, const char* format, ...)
 {
diff --git a/src/error/error_at_line.c b/src/error/error_at_line.c
index 9e9a79c..8b88df3 100644
--- a/src/error/error_at_line.c
+++ b/src/error/error_at_line.c
@@ -37,6 +37,8 @@
  * @param  linenum   The line number of in the source code file where the error occurred.
  * @param  format    Formatting-string for a detailed description of what happend.
  * @param  args      Formatting-arguments for `format`.
+ * 
+ * @since  Always.
  */
 void error_at_line(int status, int errnum, const char* filename,
 		   unsigned int linenum, const char* format, ...)
diff --git a/src/error/variables.c b/src/error/variables.c
index a31c970..b012921 100644
--- a/src/error/variables.c
+++ b/src/error/variables.c
@@ -27,6 +27,8 @@
  * This is a GNU extension.
  * 
  * @etymology  (`error`)-subsystem: (message count).
+ * 
+ * @since  Always.
  */
 volatile unsigned int error_message_count = 0;
 
@@ -48,6 +50,8 @@ volatile unsigned int error_message_count = 0;
  * This is a GNU extension.
  * 
  * @etymology  (`error`)-subsystem: print (one) time (per line).
+ * 
+ * @since  Always.
  */
 volatile int error_one_per_line = 1;
 
@@ -62,6 +66,8 @@ volatile int error_one_per_line = 1;
  * This is a GNU extension.
  * 
  * @etymology  (`error`)-subsystem function: (print) the (prog)ram's (name).
+ * 
+ * @since  Always.
  */
 void (*volatile error_print_progname)(void) = NULL;
 
diff --git a/src/error/verror.c b/src/error/verror.c
index a5a4551..3632f7c 100644
--- a/src/error/verror.c
+++ b/src/error/verror.c
@@ -34,6 +34,8 @@
  *                 be printed.
  * @param  format  Formatting-string for a detailed description of what happend.
  * @param  args    Formatting-arguments for `format`.
+ * 
+ * @since  Always.
  */
 void verror(int status, int errnum, const char* format, va_list args)
 {
diff --git a/src/error/verror_at_line.c b/src/error/verror_at_line.c
index dd51f30..ae6c566 100644
--- a/src/error/verror_at_line.c
+++ b/src/error/verror_at_line.c
@@ -42,6 +42,8 @@
  * @param  linenum   The line number of in the source code file where the error occurred.
  * @param  format    Formatting-string for a detailed description of what happend.
  * @param  args      Formatting-arguments for `format`.
+ * 
+ * @since  Always.
  */
 void verror_at_line(int status, int errnum, const char* filename,
 		    unsigned int linenum, const char* format, va_list args)