diff --git a/docs/logging.md b/docs/logging.md
index 48eb3a7..5e3a9dc 100644
--- a/docs/logging.md
+++ b/docs/logging.md
@@ -247,9 +247,11 @@ The wildcarding functionality 3. supports both `*` (matches 0 or more
 characters) and `?` (matches any single character) wildcards. Please also refer
 to [command line flags](flags.md) for more information.
 
+You can dynamically control the level of a module using the `#!cpp SetVLOGLevel` function.
+
 There's also `#!cpp VLOG_IS_ON(n)` "verbose level" condition macro. This macro
-returns `#!cpp true` when the `--v` is equal to or greater than `n`. The macro can be
-used as follows:
+returns `#!cpp true` when the matching `--vmodule`, else `--v` is equal to or greater than `n`.
+The macro can be used as follows:
 
 ``` cpp
 if (VLOG_IS_ON(2)) {
diff --git a/src/glog/vlog_is_on.h b/src/glog/vlog_is_on.h
index eb1c233..a90a409 100644
--- a/src/glog/vlog_is_on.h
+++ b/src/glog/vlog_is_on.h
@@ -103,11 +103,9 @@ namespace google {
 // Set VLOG(_IS_ON) level for module_pattern to log_level.
 // This lets us dynamically control what is normally set by the --vmodule flag.
 // Returns the level that previously applied to module_pattern.
-// NOTE: To change the log level for VLOG(_IS_ON) sites
-//	 that have already executed after/during InitGoogleLogging,
-//	 one needs to supply the exact --vmodule pattern that applied to them.
-//       (If no --vmodule pattern applied to them
-//       the value of FLAGS_v will continue to control them.)
+// NOTE: All VLOG(_IS_ON) sites that have not matched any prior module_patterns
+// will be re-evaluated with the provided module_pattern. Sites that have
+// already matched a different module_pattern will not be affected.
 extern GLOG_EXPORT int SetVLOGLevel(const char* module_pattern, int log_level);
 
 // Various declarations needed for VLOG_IS_ON above: =========================