diff --git a/README.md b/README.md
index a0a3ca9..faf7fa8 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,9 @@ nimble install https://github.com/daylinmorgan/tsm
 
 ## Usage
 
-To configure `tsm` export the environment variable `TSM_DIRS`, with a colon-delimited set of parent directories to find projects.
+To configure `tsm` export the below environment variables:
+> `TSM_DIRS`: a colon-delimited set of parent directories to find projects. \
+> `TSM_HEIGHT`: integer specifying number of rows in terminal (default: 15)
 
 For example in your rc file:
 
@@ -26,7 +28,7 @@ export TSM_DIRS="$HOME/projects/personal:$HOME/projects/work"
 ```
 
 To make full use of `tsm` you should also add a new key binding to your `tmux.conf`.
-For example you can bind the f key to show a popup with `tsm`:
+For example, you can bind the f key to show a popup with `tsm`:
 
 ```sh
 bind f display-popup \
diff --git a/src/selector.nim b/src/selector.nim
index c373ae8..822f34b 100644
--- a/src/selector.nim
+++ b/src/selector.nim
@@ -1,12 +1,24 @@
 import std/[enumerate, os, strformat, strutils, terminal]
 
 from illwill import illwillDeinit, illwillInit, getKey, Key
-import bbansi
+import term
 
 import project
 
 func toStr(k: Key): string = $chr(ord(k))
 
+proc getMaxHeight(): int =
+  result = 10
+  let setting = getEnv("TSM_HEIGHT")
+  if setting != "":
+    try:
+      result = parseInt(setting)
+    except ValueError:
+      termQuit fmt"failed to parse TSM_HEIGHT of `{setting}`, expected integer" 
+
+
+let maxHeight = getMaxHeight()
+
 type
   Cursor = object
     min, y: Natural = 1
@@ -165,7 +177,7 @@ proc draw() =
 
 proc update(s: var State) =
   s.buffer.width = terminalWidth()
-  s.buffer.height = min(terminalHeight(), 10 + state.buffer.inputPad)
+  s.buffer.height = min(terminalHeight(), maxHeight + state.buffer.inputPad)
   s.cursor.max = s.buffer.height - state.buffer.inputPad
 
 proc clear(b: var Buffer) =
diff --git a/src/term.nim b/src/term.nim
index 6fb7788..f28a3ac 100644
--- a/src/term.nim
+++ b/src/term.nim
@@ -1,6 +1,6 @@
 import std/strutils
 import bbansi
-
+export bbansi
 const
   sep = " [magenta]|[/] "
   prefix = "[cyan]tsm[/]" & sep