Rephrase comment in SystemClock. (#521)
diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/time/internal/SystemClock.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/time/internal/SystemClock.java
index 59823bf..d09537c 100644
--- a/log4j-core/src/main/java/org/apache/logging/log4j/core/time/internal/SystemClock.java
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/time/internal/SystemClock.java
@@ -27,9 +27,11 @@
* Implementation of the {@code Clock} interface that returns the system time.
* @since 2.11.0
*/
-// Precise clock is not implemented because the instant() method in the init method is not garbage free.
public final class SystemClock implements Clock, PreciseClock {
+ /**
+ * The precise clock is not enabled by default, since access to it is not garbage free.
+ */
private static final boolean USE_PRECISE_CLOCK = PropertiesUtil.getProperties()
.getBooleanProperty("log4j2.usePreciseClock", false);
/**
