diff --git a/builtin_interfaces/msg/Duration.msg b/builtin_interfaces/msg/Duration.msg
index fab5e4fe..e6734af4 100644
--- a/builtin_interfaces/msg/Duration.msg
+++ b/builtin_interfaces/msg/Duration.msg
@@ -5,5 +5,5 @@
 # Seconds component, range is valid over any possible int32 value.
 int32 sec
 
-# Nanoseconds component in the range of [0, 10e9).
+# Nanoseconds component in the range of [0, 1e9).
 uint32 nanosec
diff --git a/builtin_interfaces/msg/Time.msg b/builtin_interfaces/msg/Time.msg
index 874f15e0..dffade0e 100644
--- a/builtin_interfaces/msg/Time.msg
+++ b/builtin_interfaces/msg/Time.msg
@@ -4,5 +4,5 @@
 # The seconds component, valid over all int32 values.
 int32 sec
 
-# The nanoseconds component, valid in the range [0, 10e9).
+# The nanoseconds component, valid in the range [0, 1e9).
 uint32 nanosec