Update README to note that data was added for Puerto Rico municipios starting 5/5.

diff --git a/README.md b/README.md
index 2e57966..56ffcbd 100644 (file)
--- a/README.md
+++ b/README.md
@@ -205,6 +205,8 @@ Counts for Guam include cases reported from the USS Theodore Roosevelt.
 
 * Puerto Rico
 
+Data for Puerto Rico's county-equivalent municipios are available starting on May 5. This data was not available at the beginning of the outbreak and so all cases and deaths were assigned to Unknown.
+
 On April 21, the territory's health department revised their number of cases downward, saying they had been double counting some coronavirus patients in official reports, leading to a higher number of cases reported than actually confirmed. 
 
 * North Dakota