diff --git a/config.h b/config.h
index 2617b4a..95f0db0 100644
--- a/config.h
+++ b/config.h
@@ -103,6 +103,7 @@ binding keys[] = {
 	{ .mod = Mod4Mask, .key = XK_r, .act = ACTION_ROLLBACK },
 
 	// Find or start apps by WM_CLASS (lower case match).
+	// Only works for apps that use some form of their binary name as their class...
 	{ .mod = AnyModifier, .key = XK_F1, .act = ACTION_FIND_OR_START, .data = "urxvt"    },
 	{ .mod = AnyModifier, .key = XK_F2, .act = ACTION_FIND_OR_START, .data = "chromium" },
 	{ .mod = AnyModifier, .key = XK_F3, .act = ACTION_FIND_OR_START, .data = "pcmanfm"  },