update README

README.md

@@ -24,8 +24,9 @@ ZelaiHandi, which means "large pasture" in Basque, is the largest collection of
 This collection comprises approximately 660 million words.
 
 The dataset will receive periodical updates.
-- v2 (February 17th, 2025): 660M words, 7 new sources.
-- v1 (March 4th, 2024): 521M words.
+
+- **v2 (February 17th, 2025): 660M words, 7 new sources.**
+- v1 (March 4th, 2024): 521M words. 
 
 The corpus has been released with the objective of “feeding” Large Language Models. Naturally, models that are not strictly "herbivorous" can also ingest ZelaiHandi.
 
@@ -137,6 +138,15 @@ This corpus may reflect societal stereotypes and biases. Additionally, it could
 <!--Users should be made aware of the risks, biases and limitations of the dataset. 
 We suggest filtering sources as literature and subtitles that might contain hate speech, slurs or explicit language before pretraining an LLM for end tasks like interactive chat.-->
 
+
+## Previous releases
+
+If you need a previous release clone this repository and get back to a previos release: 
+
+- v2: ```shell $git checkout main```
+- v1: ```shell $git checkout 1c61663c8361779898472a7eb6ac2c69c775ed5b```
+
+
 ## Citation
 
 <!--We plan to release a paper soon, but, for now, please, cite as follows:-->