add mention of boolean on RLE

src/thrift/parquet.thrift

diff --git a/src/thrift/parquet.thrift b/src/thrift/parquet.thrift
index 2e93ede..cece73e 100644
--- a/src/thrift/parquet.thrift
+++ b/src/thrift/parquet.thrift
@@ -140,7 +140,7 @@
   PLAIN_DICTIONARY = 2;
 
   /** Group packed run length encoding. Usable for definition/reptition levels
-   * encoding
+   * encoding and Booleans (on one bit: 0 is false; 1 is true.)
    */
   RLE = 3;
 
@@ -163,6 +163,7 @@
    * Suffixes are stored as delta length byte arrays.
    */
   DELTA_STRINGS = 7;
+
 }
 
 /**