diff --git a/example/jsonptr/jsonptr.cc b/example/jsonptr/jsonptr.cc
index 64de0c2..c4ff7df 100644
--- a/example/jsonptr/jsonptr.cc
+++ b/example/jsonptr/jsonptr.cc
@@ -301,7 +301,8 @@
 
 int g_input_file_descriptor = 0;  // A 0 default means stdin.
 
-#define MAX_INDENT 8
+// parse_flags enforces that g_flags.spaces <= 8 (the length of
+// INDENT_SPACES_STRING).
 #define INDENT_SPACES_STRING "        "
 #define INDENT_TAB_STRING "\t"