From 84547d9536e626d645ea79532f61e0ac6414883b Mon Sep 17 00:00:00 2001
From: Martin Reinecke <martin@mpa-garching.mpg.de>
Date: Tue, 17 Jul 2012 11:36:22 +0200
Subject: [PATCH] doc update

---
 c_utils/walltime_c.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/c_utils/walltime_c.h b/c_utils/walltime_c.h
index ea9d2a2..c291f17 100644
--- a/c_utils/walltime_c.h
+++ b/c_utils/walltime_c.h
@@ -43,7 +43,8 @@ extern "C" {
     <li> \a MPI_Wtime(), if MPI is available
     <li> \a gettimeofday() otherwise
     </ul>
-    \note Only useful for measuring time differences. */
+    \note Only useful for measuring time differences.
+    \note This function has an execution time between 10 and 100 nanoseconds. */
 double wallTime(void);
 
 #ifdef __cplusplus