diff --git a/README.md b/README.md
index 6e2c642..9f8cf5a 100644
--- a/README.md
+++ b/README.md
@@ -405,6 +405,11 @@ Now that you have created two tables, you'll see entries for them in the `pointc
 > Returns a patch with only points whose values are the same as the supplied values
 > for the requested dimension.
 
+**PC_Compress(p pcpatch,global_compression_scheme text,comma_separated_compression_style text)** returns **pcpatch**
+
+> Returns a patch with manually set compression for every dimension
+> only global_compression_scheme authorized is 'dimensional'
+> compression_style authorized values are 'auto', 'zlib','sigbits','rle'
 
 ## PostGIS Integration ##