diff --git a/src/search.cpp b/src/search.cpp
index eb7666af..1ae6b892 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -318,8 +318,8 @@ void init_search() {
 }
 
 
-/// perft() is our utility to verify move generation. All the legal moves up to
-/// given depth are generated and counted and the sum returned.
+/// perft() is our utility to verify move generation. All the leaf nodes up to
+/// the given depth are generated and counted and the sum returned.
 
 int64_t perft(Position& pos, Depth depth) {
 
diff --git a/src/uci.cpp b/src/uci.cpp
index 39270c6f..2dacd1c2 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -224,7 +224,7 @@ namespace {
 
   // perft() is called when engine receives the "perft" command.
   // The function calls perft() passing the required search depth
-  // then prints counted nodes and elapsed time.
+  // then prints counted leaf nodes and elapsed time.
 
   void perft(Position& pos, UCIParser& up) {