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[sbcl.git] / src / code / time.lisp

diff --git a/src/code/time.lisp b/src/code/time.lisp
index 6cdb53d..15d4c8d 100644 (file)
--- a/src/code/time.lisp
+++ b/src/code/time.lisp
@@ -46,11 +46,11 @@ Includes both \"system\" and \"user\" time."
 ;;; number of seconds since 1970-01-01
 
 ;;; I'm obliged to Erik Naggum's "Long, Painful History of Time" paper
-;;; <http://heim.ifi.uio.no/~enag/lugm-time.html> for the choice of epoch
-;;; here.  By starting the year in March, we avoid having to test the month
-;;; whenever deciding whether to account for a leap day.  2000 is especially
-;;; special, because it's disvisible by 400, hence the start of a 400 year
-;;; leap year cycle
+;;; <http://naggum.no/lugm-time.html> for the choice of epoch here.
+;;; By starting the year in March, we avoid having to test the month
+;;; whenever deciding whether to account for a leap day.  2000 is
+;;; especially special, because it's divisible by 400, hence the start
+;;; of a 400 year leap year cycle
 
 ;;; If a universal-time is after time_t runs out, we find its offset
 ;;; from 1st March of whichever year it falls in, then add that to
@@ -257,8 +257,10 @@ format."
 
 (defvar *gc-run-time* 0
   #!+sb-doc
-  "the total CPU time spent doing garbage collection (as reported by
-   GET-INTERNAL-RUN-TIME)")
+  "Total CPU time spent doing garbage collection (as reported by
+GET-INTERNAL-RUN-TIME.) Initialized to zero on startup. It is safe to bind
+this to zero in order to measure GC time inside a certain section of code, but
+doing so may interfere with results reported by eg. TIME.")
 (declaim (type index *gc-run-time*))
 
 (defun print-time (&key real-time-ms user-run-time-us system-run-time-us