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-rw-r--r--build/algorithm6
1 files changed, 5 insertions, 1 deletions
diff --git a/build/algorithm b/build/algorithm
index 1cfd15b..f108a8a 100644
--- a/build/algorithm
+++ b/build/algorithm
@@ -134,7 +134,11 @@ namespace build
reverse_execute_prerequisites (action, target&);
// A version of the above that also determines whether the action
- // needs to be executed on the target based on the passed timestamp.
+ // needs to be executed on the target based on the passed mtime
+ // timestamp.
+ //
+ // Note that because we use mtime, this function should normally
+ // only be used in the perform_update action.
//
bool
execute_prerequisites (action, target&, const timestamp&);