diff --git a/doc/zf.1 b/doc/zf.1
index b12b8c3..d112cbf 100644
--- a/doc/zf.1
+++ b/doc/zf.1
@@ -50,6 +50,24 @@ Show version information and exit
 .BR \-h ", " \-\-help
 Display help and exit
 
+.SH ENV VARIABLES
+
+.BR ZF_PROMPT
+Override the default >  prompt by assigning a string to this variable.
+For example export ZF_PROMPT="$ ".
+
+.BR ZF_HIGHLIGHT
+Set the color used to highlight matches. Valid colors are: black, red, green, yellow, blue, magenta, cyan, white
+bright_black, bright_red, bright_green, bright_yellow, bright_blue, bright_magenta, bright_cyan, and bright_white.
+The default color is cyan.
+
+.BR ZF_VI_MODE
+When this variable is present and not empty ctrl+k moves up a line. When disabled ctrl+k deletes from the cursor
+to the end of line.
+
+.BR NO_COLOR
+Disables colors. See https://no-color.org
+
 .SH COMMANDS
 
 .TP
diff --git a/doc/zf.md b/doc/zf.md
index 35c19ba..ac5a2c4 100644
--- a/doc/zf.md
+++ b/doc/zf.md
@@ -28,11 +28,13 @@ Matching is case insensitive unless an uppercase letter is found in the query.
 
 ## ENV VARIABLES
 
-`ZF_PROMPT` : Override the default `> ` prompt by assigning a string to this variable. For example `export ZF_PROMPT="$ "`.
+`ZF_PROMPT`: Override the default `> ` prompt by assigning a string to this variable. For example `export ZF_PROMPT="$ "`.
 
-`ZF_VI_MODE` : When this variable is present and not empty `ctrl+k` moves up a line. When disabled `ctrl+k` deletes from the cursor to the end of line
+`ZF_HIGHLIGHT`: Set the color used to highlight matches. Valid colors are: black, red, green, yellow, blue, magenta, cyan, white, bright_black, bright_red, bright_green, bright_yellow, bright_blue, bright_magenta, bright_cyan, and bright_white. The default color is cyan.
 
-`NO_COLOR` : Disables colors. See https://no-color.org
+`ZF_VI_MODE`: When this variable is present and not empty `ctrl+k` moves up a line. When disabled `ctrl+k` deletes from the cursor to the end of line.
+
+`NO_COLOR`: Disables colors. See https://no-color.org.
 
 ## COMMANDS