diff --git a/themes/powerline-naked/README.md b/themes/powerline-naked/README.md
index 6928b862..510e0301 100644
--- a/themes/powerline-naked/README.md
+++ b/themes/powerline-naked/README.md
@@ -56,7 +56,7 @@ The contents of the prompt can be "reordered", all the "segments" (every piece o
 * `wd` - Working directory, like `cwd` but doesn't show the full folder
   hierarchy, only the directory you're currently in.
 
-A variables can be defined to set the order of the prompt segments:
+A variable can be defined to set the order of the prompt segments:
 
     POWERLINE_PROMPT="user_info scm python_venv ruby cwd"
 
diff --git a/themes/powerline-plain/README.md b/themes/powerline-plain/README.md
index 941666a2..8c8647e3 100644
--- a/themes/powerline-plain/README.md
+++ b/themes/powerline-plain/README.md
@@ -54,7 +54,7 @@ The contents of the prompt can be "reordered", all the "segments" (every piece o
 * `wd` - Working directory, like `cwd` but doesn't show the full folder
   hierarchy, only the directory you're currently in.
 
-A variables can be defined to set the order of the prompt segments:
+A variable can be defined to set the order of the prompt segments:
 
     POWERLINE_PROMPT="user_info scm python_venv ruby cwd"
 
diff --git a/themes/powerline/README.md b/themes/powerline/README.md
index 44e4a8e3..7c1a135c 100644
--- a/themes/powerline/README.md
+++ b/themes/powerline/README.md
@@ -58,7 +58,7 @@ The contents of the prompt can be "reordered", all the "segments" (every piece o
 * `wd` - Working directory, like `cwd` but doesn't show the full folder
   hierarchy, only the directory you're currently in.
 
-A variables can be defined to set the order of the prompt segments:
+A variable can be defined to set the order of the prompt segments:
 
     POWERLINE_PROMPT="user_info scm python_venv ruby cwd"