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-rw-r--r--libguile/scmsigs.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libguile/scmsigs.c b/libguile/scmsigs.c
index 31952da0c..5a584bc44 100644
--- a/libguile/scmsigs.c
+++ b/libguile/scmsigs.c
@@ -418,7 +418,8 @@ SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0,
#if defined(USE_THREADS) || defined(HAVE_USLEEP)
SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0,
(SCM i),
- "")
+ "Sleep for I microseconds.\n"
+ "`usleep' is not available on all platforms.")
#define FUNC_NAME s_scm_usleep
{
SCM_VALIDATE_INUM_MIN (1,i,0);