Added a comment about EF_STYLE in sky130/README
diff --git a/sky130/README b/sky130/README
index 0772cd4..4f650ca 100644
--- a/sky130/README
+++ b/sky130/README
@@ -74,10 +74,13 @@
Edit the Makefile to set the following definitions for your host system:
EF_STYLE = Select "1" for an efabless-style file structure, "0"
- otherwise. There are only minor differences in
- these two styles, namely for version tracking of
- the Magic setup files, and the location of the
- technology LEF file.
+ otherwise. There are some differences in
+ these two styles, the most important of which being
+ that the order of directories for the IP libraries
+ is <file_format>/<library_name> instead of
+ <library_name>/<file_format>. Other differences
+ include version tracking of the Magic setup files
+ and the location of the technology LEF file.
LINK_TARGETS = "none" or "source". "none" copies files from the source
directories to the target. "source" makes symbolic links
