diff --git a/doc/rofi-theme-selector.1 b/doc/rofi-theme-selector.1
index 6a9630c7..47d0bff7 100644
--- a/doc/rofi-theme-selector.1
+++ b/doc/rofi-theme-selector.1
@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "ROFI\-THEME\-SELECTOR" "1" "May 2018" "" ""
+.TH "ROFI\-THEME\-SELECTOR" "1" "January 2018" "" ""
 .
 .SH "NAME"
 \fBrofi\-theme\-selector\fR \- Preview and apply themes for \fBrofi\fR
diff --git a/doc/rofi-theme.5 b/doc/rofi-theme.5
index d51ede3e..23ba0f54 100644
--- a/doc/rofi-theme.5
+++ b/doc/rofi-theme.5
@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "ROFI\-THEME" "5" "June 2018" "" ""
+.TH "ROFI\-THEME" "5" "July 2018" "" ""
 .
 .SH "NAME"
 \fBrofi\-theme\fR \- Rofi theme format files
@@ -272,6 +272,9 @@ an orientation
 a list of keywords
 .
 .IP "\(bu" 4
+an environment variable
+.
+.IP "\(bu" 4
 Inherit
 .
 .IP "" 0
@@ -714,6 +717,28 @@ Format: \fB[ keyword, keyword ]\fR
 .P
 A list starts with a \'[\' and ends with a \']\'\. The entries in the list are comma\-separated\. The \fBkeyword\fR in the list refers to an widget name\.
 .
+.SH "Environment variable"
+.
+.IP "\(bu" 4
+Format: \fB${:alnum:}\fR
+.
+.IP "" 0
+.
+.P
+This will parse the environment variable as the property value\. (that then can be any of the above types)\. The environment variable should be an alphanumeric string without white\-space\.
+.
+.IP "" 4
+.
+.nf
+
+* {
+    background\-color: ${BG};
+}
+.
+.fi
+.
+.IP "" 0
+.
 .SH "Inherit"
 .
 .IP "\(bu" 4
diff --git a/doc/rofi-theme.5.markdown b/doc/rofi-theme.5.markdown
index a7bee6d6..e49246fb 100644
--- a/doc/rofi-theme.5.markdown
+++ b/doc/rofi-theme.5.markdown
@@ -189,6 +189,7 @@ The current theme format supports different types:
  * a reference
  * an orientation
  * a list of keywords
+ * an environment variable
  * Inherit
 
 Some of these types are a combination of other types.
@@ -443,6 +444,19 @@ Specify the orientation of the widget.
 A list starts with a '[' and ends with a ']'. The entries in the list are comma-separated.
 The `keyword` in the list refers to an widget name.
 
+## Environment variable
+
+* Format: `${:alnum:}`
+
+This will parse the environment variable as the property value. (that then can be any of the above types).
+The environment variable should be an alphanumeric string without white-space.
+
+```
+* {
+    background-color: ${BG};
+}
+```
+
 ## Inherit
 
  * Format: `inherit`