Update README.md

README.md

@@ -17,6 +17,7 @@ We also recommend to use `mamba, which is more faster in solving environment dep
 conda create -n epik
 conda activate epik
 conda config --set channel_priority strict
+# note that we install both ipk (database creation) and epik (phylogenetic placement)
 mamba install ipk epik
 ```