diff --git a/6502/C64/Makefile b/6502/C64/Makefile
index a5cc9bb..b322042 100644
--- a/6502/C64/Makefile
+++ b/6502/C64/Makefile
@@ -56,10 +56,12 @@ cbmfiles/c64-vf-latest: emulator/tcbase.T64 emulator/build-vf.sh \
     disks/vforth4_2.d64 disks/tc38q.d64 $(vf_fth_files_petscii)
 	emulator/build-vf.sh vf-c64-main.fth c64-vf-latest
 
+# C16 with 32 kB RAM - called (C16- in the sources.
 cbmfiles/c16-vf-latest: emulator/tcbase.T64 emulator/build-vf.sh \
     disks/vforth4_2.d64 disks/tc38q.d64 $(vf_fth_files_petscii)
 	emulator/build-vf.sh vf-c16-main.fth c16-vf-latest
 
+# C16 with 64 kB RAM or Plus4 - called (C16+ in the sources.
 cbmfiles/c16p-vf-latest: emulator/tcbase.T64 emulator/build-vf.sh \
     disks/vforth4_2.d64 disks/tc38q.d64 $(vf_fth_files_petscii)
 	emulator/build-vf.sh vf-c16p-main.fth c16p-vf-latest