diff --git a/rmw/include/rmw/validate_full_topic_name.h b/rmw/include/rmw/validate_full_topic_name.h
index d2461dd9..4b61f3d2 100644
--- a/rmw/include/rmw/validate_full_topic_name.h
+++ b/rmw/include/rmw/validate_full_topic_name.h
@@ -89,7 +89,7 @@ rmw_validate_full_topic_name(
   int * validation_result,
   size_t * invalid_index);
 
-/// Deterimine if a given topic name is valid.
+/// Determine if a given topic name is valid.
 /**
  * This is an overload with an extra parameter for the length of topic_name.
  *
diff --git a/rmw/include/rmw/validate_namespace.h b/rmw/include/rmw/validate_namespace.h
index b13cf80e..abc927f8 100644
--- a/rmw/include/rmw/validate_namespace.h
+++ b/rmw/include/rmw/validate_namespace.h
@@ -97,7 +97,7 @@ rmw_validate_namespace(
   int * validation_result,
   size_t * invalid_index);
 
-/// Deterimine if a given namespace is valid.
+/// Determine if a given namespace is valid.
 /**
  * This is an overload with an extra parameter for the length of namespace_.
  * If a non RMW_RET_OK return value is returned, the RMW error message will be set.
diff --git a/rmw/include/rmw/validate_node_name.h b/rmw/include/rmw/validate_node_name.h
index ae49bacb..2924cd00 100644
--- a/rmw/include/rmw/validate_node_name.h
+++ b/rmw/include/rmw/validate_node_name.h
@@ -83,7 +83,7 @@ rmw_validate_node_name(
   int * validation_result,
   size_t * invalid_index);
 
-/// Deterimine if a given node name is valid.
+/// Determine if a given node name is valid.
 /**
  * This is an overload with an extra parameter for the length of node_name.
  *