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README.md

@@ -6,7 +6,10 @@ All materials for each meeting are in separate directories (folders). Each is a
 
 ## Meetings
 
+### Fall 2020
 - [2020-11-04](https://github.com/an-bui/UCSB-EEMB-DAnC/tree/main/2020-11-04-intro_to_R-part01): scripts and markdown structure, basic vectors and subsetting
 - [2020-11-19](https://github.com/an-bui/UCSB-EEMB-DAnC/tree/main/2020-11-19-intro_to_R-part02): recap of first meeting, filtering data frames
 - [2020-12-03](https://github.com/an-bui/UCSB-EEMB-DAnC/tree/main/2020-12-03-intro_to_R-part03): recap of second meeting, piping using `magrittr:%>%` and `ggplot2` functions
+
+### Winter 2021
 - [2021-01-18](https://github.com/an-bui/UCSB-EEMB-DAnC/tree/main/2021-01-18-intro_to_R-review): review of all materials from fall quarter using marbles data