diff --git a/Makefile b/Makefile
index ecafa0c..d4e8d49 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+
 # - - - - - - - #
 #               #
 #    COLORS     #
@@ -24,10 +25,12 @@ B_WHITE  = "\e[1;37m"
 
 RESET    = "\e[0m"
 
+
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
-#               . name = value \          . += append to a variable   #
-#   VARIABLES   .        value            . != set result of command  #
-#               . name is case sensitive  . ?= set if not already set #
+#             . name = value \    . += append to a variable           #
+#  VARIABLES  .        value      . != set result of command          #
+#             .                   . ?= set if not already set         #
+#             . (case sensitive)  . := expand once at definition line #
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
 
 NAME          = containers
@@ -79,6 +82,7 @@ DEPS          = $(OBJS:.o=.d) #see end-page note on header dependencie
 #             .  target: prerequisites    .   $@ : target             #
 #    RULES    .          recipe           .   $< : 1st prerequisite   #
 #             .          @recipe (silent) .   $^ : all prerequisites  #
+#             .  target: VAR = assignment .   |  : order-only prereq. #
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
 
 all: $(NAME_FT) $(NAME_STL)