diff --git a/docs/21-tutorial-jrpg.md b/docs/21-tutorial-jrpg.md
index c30661c..a67d1a8 100644
--- a/docs/21-tutorial-jrpg.md
+++ b/docs/21-tutorial-jrpg.md
@@ -962,6 +962,13 @@ range, otherwise do nothing.
 #define TALK_RANGE      64.0f
 ```
 
+**Place your NPCs with that number in mind.** The distance is measured between the two
+actors' positions, and both sprites are 32 pixels, so 64 is two sprite widths — close, by
+design. An NPC parked behind a building or across a wall from anywhere the player can stand
+is an NPC the player can see and never talk to, and nothing reports that: the handler finds
+nobody in range and returns success. If a conversation will not open, print the distance
+before you go looking at the code.
+
 ```c excerpt=examples/jrpg/world.c
 #define TOWNSFOLK_COUNT (sizeof(TOWNSFOLK) / sizeof(TOWNSFOLK[0]))
 ```