diff --git a/datastores/spanner-google-globally-distributed-database.pdf b/datastores/spanner-google-globally-distributed-database.pdf
deleted file mode 100644
index 809979d..0000000
Binary files a/datastores/spanner-google-globally-distributed-database.pdf and /dev/null differ
diff --git a/distributed_systems/Cassandra.PDF b/distributed_systems/cassandra-a-decentralized-structured-storage-system.pdf
similarity index 100%
rename from distributed_systems/Cassandra.PDF
rename to distributed_systems/cassandra-a-decentralized-structured-storage-system.pdf
diff --git a/concurrency/communicating-sequential-processes-paper.pdf b/processes/communicating-sequential-processes-paper.pdf
similarity index 100%
rename from concurrency/communicating-sequential-processes-paper.pdf
rename to processes/communicating-sequential-processes-paper.pdf
diff --git a/sports-analytics/2014-ssac-pointwise-predicting-points-and-valuing-decisions-in-real-time.pdf b/sports_analytics/2014-ssac-pointwise-predicting-points-and-valuing-decisions-in-real-time.pdf
similarity index 100%
rename from sports-analytics/2014-ssac-pointwise-predicting-points-and-valuing-decisions-in-real-time.pdf
rename to sports_analytics/2014-ssac-pointwise-predicting-points-and-valuing-decisions-in-real-time.pdf