diff --git a/content/v2.0/reference/glossary.md b/content/v2.0/reference/glossary.md
index a99aa47d4..4282cb367 100644
--- a/content/v2.0/reference/glossary.md
+++ b/content/v2.0/reference/glossary.md
@@ -59,7 +59,7 @@ Related entries: [output plugin](#output-plugin)
 
 ### bin
 
-Includes all data points less than or equal to a specified upper bound.
+In a cumulative histogram, a bin includes all data points less than or equal to a specified upper bound. In a normal histogram, a bin includes all data points between the upper and lower bounds.
 
 ### block
 
@@ -68,8 +68,8 @@ In Flux, a block is a possibly empty sequence of statements within matching brac
 - Explicit blocks in the source code, for example:
 
 ```
-Block         = "{" StatementList "} 
-StatementList = { Statement } 
+Block         = "{" StatementList "}
+StatementList = { Statement }
 ```
 
 - Implicit blocks, including:
@@ -190,6 +190,12 @@ Stores time series data and handles writes and queries.
 
 Related entries: [data node](#data-node)
 
+### data source
+
+A source of data that InfluxDB collects or queries data from. Examples include InfluxDB buckets, Prometheus, Postgres, MySQL, and InfluxDB clients.
+
+Related entries: [bucket](#bucket)
+
 ### data type
 
 A data type is defined by the values it can take, the programming language used, or the operations that can be performed on it.
@@ -491,7 +497,6 @@ Contains internal information about the status of the system.
 The metastore contains the user information, buckets, shard metadata, tasks, and subscriptions.
 
 Related entries: [bucket](#bucket), [retention policy](#retention-policy-rp), [user](#user)
-
 -->
 
 ### metric
@@ -768,21 +773,16 @@ A visualization that displays the numeric value of the most recent point in a ta
 
 InfluxDB uses snappy compression to compress batches of points. To improve space and disk IO efficiency, each batch is compressed before being written to disk.
 
-### source
+<!-- in development ### stacked graph
 
-An InfluxDB data source is selected for each bucket in an organization. Data can be streamed, scraped, or ingested using line protocol.
-
-Related entries: [bucket](#bucket), [organization](#organization), [stream](#stream), [scrape](#scrape), [line protocol](#line protocol)
-
-### stacked graph
-
-A visualization that displays groups in a bin are stacked on top of each other.
+A visualization that displays points sharing a common X value as stacked rather than overlaid. Hence, the Y value is equal to the sum of Y values.
 
 Related entries: [bin](#bin)
+-->
 
 ### step-plot
 
-A visualization that displays a time series in a staircase graph.
+In InfluxDB 1.x, a [step-plot graph](https://docs.influxdata.com/chronograf/v1.7/guides/visualization-types/#step-plot-graph) displays time series data in a staircase graph. In InfluxDB 2.0, generate a similar graph using the step interpolation option for [line graphs](https://v2.docs.influxdata.com/v2.0/visualize-data/visualization-types/graph/#options).
 
 ### stream
 
@@ -792,21 +792,23 @@ Flux processes streams of data. A stream includes a series of tables over a sequ
 
 A data type used to represent text.
 
-
 ## T
 
 ### TCP
 
-InfluxDB uses TCP port 9999 for client-server communication over the InfluxDB HTTP API.
+InfluxDB uses Transmission Control Protocol (TCP) port 9999 for client-server communication over the InfluxDB HTTP API.
 
 <!--ports for InfluxDB Enterprise -->
 
-<!-- ### TSL - I can't find any info about TSL other than a github issue that says we need to document it. :-) 
+### TSL
+
+The Time Series Logs (TSL) extension (.tsl) identifies Time Series Index (TSI) log files, generated by the tsi1 engine.
+
 
 ### TSM (Time-structured merge tree)
 
 ### TSM file
--->
+
 
 ### table